Zeroing Sequence of a VCD/SEQ 8 Machine:
The following chart shows full zeroing sequence of VS8. These events occur sequentially and if any condition is not satisfied, machine will not complete zeroing process..
48797301 board
Procedure
Symptoms of corrupted BIOS and/or Boot Block:
Steps to take:
Figure 1 EPC-1316 Board jumper pin location
Figure 2 EPC-1316 Board jumper pin numbering
Figure 3 EPC-1316 Board flash jumpers configuration
UIC, EPC-1316 Boot Sector and BIOS Corruption Procedure for Re-flash
Procedure
Symptoms of corrupted BIOS and/or Boot Block:
Steps to take:
Figure 1 EPC-1316 Board jumper pin location
Figure 2 EPC-1316 Board jumper pin numbering
Figure 3 EPC-1316 Board flash jumpers configuration
The Through Hole Assembly, also known as thru hole assembly, process uses the latest models with the quickest possible turnaround rate in the industry. Assembling excellent stable sequencing performance with easy operating software utilizing its high precision through hole assembly both by hand and automation to create electronic solder connections.
Automatic PIN/ Eyelet/Terminal insertion:
ManualPIN/ Eyelet/Terminal insertion:
Features:
1.Control System: PC + Siemens PLC control system,accurate temperature control and more stable,ensures temperature stability rate to be more than 99.99%.
2.Hot air system: first-class heating module, the best temperature zone interval design makes optimum temperature uniformity and repeat.The effective utilization and thermal compensation efficiency,it needs less than 20 minutes from temperature control accuracy ± 1 ℃ ambient temperature to a temperature stabilization .
3.Monitoring Software:Windows interface, traditional and simplified Chinese and English online free switch, and operator password management, easy to operate.Operation records, temperature curve measurement and analysis functions, virtual simulation, fault self-diagnosis, process monitoring, automatic generate and save process control documents, substrate transport dynamic display.
4.Cooling System: new cooling zone, quick and easy adjustment, easily reach the cooling requirements of different slopes.
5.Temperature protection: using third-party over-temperature protection, multiple layers protection to ensure safe operation.
6.Products comply with CE, CCC, UL , other standards and specifications.
7.User-friendly design: fault detection (such as heaters abnormal alarm, etc.), regular maintenance reminders, the economy functions and tool-free maintenance, reducing equipment failure rates.
8.Heating module: Transverse reflow design makes temperature from each zone is not influenced by neibour to ensure accurate temperature curve, while ensuring a high production capacity and heat exchange capacity to achieve high adaptability (to meet the soldering of automotive, communications, electronics, computers and mobile phones consumer electronics.)
9.Hot air motor with independently inverter controlled, set operating frequencies depending on different technology to meet a variety of lead-free processes.
10. Machine using zero gas source design, furnace cover with motor lifting, safety rod support, providing significant security.
11.Main parts:Imported main parts ensure equipment runs smoothly and lower the maintenance cost.
12. Customers can choose optional flux processing system according to their own production features to ensure furnace chamber clean.
13.Closed-loop transmission speed control systems, transportation accuracy ± 2mm / min, ensuring more stable transmission speed.
14.Central support, dual transmission, external water cooling system is optional.
TOP Advantage:
1.Simple: combined with advanced international concepts, based on the Oriental-designed operating system, easy to understand, easy to learn, easy to maintain.
2.Expertise: learn imported reflow oven’s advanced design concepts, and the machine core components are using imported top brands.
3.Hedging: Import hardware configuration,low failure rate in production,more than a decade service life.
4.Safety: Based on the general rules of international design, close to imported reflow rating, the highest security level.
5.Stable: mature software, hardware and top production processes ensures stability of each equipment.
Application
Widely used in high precision products like 01005-QFP, BGA, CSP, Flip,and POP ,automotive electronics, mobile devices, home appliances, communications, LED, semiconductor and other industries.
Specification:
| Southern Machinery Reflow Oven Specifications | |||||
| S – Standard, O – Option, M – Manual, A – Auto, N/A – Not Availible) | |||||
| Specifications | S-R800 | S-R1000 | Specifications | E8 | E10 |
| Dimension (L*W*H)mm | 5310x1353x1490 | 6100x1353x1490 | Board Dropped Alarm | S | S |
| Standard Color | Computer Grey | Computer Grey | Electrical SMEMA Interface | S | S |
| Weight | Approx.2150KG | Approx.2400KG | Computer | Lenovo | Lenovo |
| Number Of Heating Zones | Up8/Bottom8 | Up10/Bottom10 | Max.Width Of PCB | 400mm | 400mm |
| Length Of Heating Zones | 3121mm | 3891mm | Temperature Deviation on PCB | ± 1.0℃ | ± 1.0℃ |
| Rail Width Adjustment | A and M(Multi mode) | A and M(Multi mode) | Max. Temp. Gap Between Preheat Zones Setting | 40℃ | 40℃ |
| Rail Number | 1 Lane or 2 Land | 1 Lane or 2 Land | Temperature Control Precision | ± 1.0℃ | ± 1.0℃ |
| Exhaust Volume | 10M3/minx2 Exhausts | 10M3/minx2 Exhausts | Conveyor Height | 900+/-20mm | 900+/-20mm |
| Control System | PLC+Computer | PLC+Computer | Length Of Cooling Zones | 600mm | 600mm |
| Transmission Agent | Chain + Mesh | Chain + Mesh | Center Support | O | O |
| Electric Supply Required | 3phase,380V 50/60Hz | 3phase,380V 50/60Hz | Siemens PLC | S | S |
| Power For Warm Up | 30KW | 36KW | Lubrication Auto-Afflux | S | S |
| Power Consumption | 8KW | 12KW | Ups | S | S |
| Warming Time | Approx.25 minute | Approx.25 minute | Temp. Thermocouple Slot | S | S |
| Temp. Setting Range | Room Temp.– 300℃ | Room Temp.– 300℃ | Driven Top Hood Opening | A | A |
| Oil Supply | A and M(Multi mode) | A and M(Multi mode) | Temperature Control Method PID + SSR | S | S |
| Conveyor Speed Range | 300~2000mm/min | 300~2000mm/min | Number of Cooling Zones | 2 | 2 |
| Components Clearance | Top/ Bottom is 25mm | Top/ Bottom is 25mm | On Line Editing | S | S |
| Conveyor Direction | L→R (Option: R→L) | L→R (Option: R→L) | Max.Temp.Gap Between Preheat & Reflow Setting | 80℃ | 80℃ |
| Commutated Element | Aluminum Alloy Plate (8mm) | Aluminum Alloy Plate (8mm) | Max. Temp. Gap Between Reflow Zones Setting | 50℃ | 50℃ |
| Fixed Rail Side | Front Fixed (Option:Rear Fixed) | Front Fixed (Option:Rear Fixed) | Process Data & Status Storage | S | S |
| Cooling Method | Forced-Air Motor and fan (Standard) | Forced-Air Motor and fan (Standard) | Temperature Alarm | S | S |
S-R1000’s heating zone temperature controllers have an accuracy of ±1°C and, in conjunction with a high-speed blower adjacent to each heat source for maximum convection, ensure a ΔT of ±2°C across the PCB assembly. The Series diffuser design provides low-velocity, low-turbulence air flow to prevent component shift or disturbance.
Optional thermocouples can be attached at critical locations on the PCB and connected to three built-in inputs (standard) on the oven for communication with control software for accurate, real-time temperature profiling to match any solder paste manufacturer’s specifications.
The S-R1000 is supplied as standard with an adjustable-rail, pin-type conveyor system that handles PCBs up to a maximum of 450 mm (17.7″) installed over a 570 mm (22″) stainless-steel mesh belt. The pin conveyor permits inline and double-sided processing. The mesh belt is ideal for fast changeovers.
To eliminate the possibility of jamming or dropped PCB assemblies, all components are constructed of high-quality, high-strength, stainless steel and are built to maintain dimensional tolerances at the high temperatures of lead-free processing.
Advanced automatic chain lubrication and motorized width adjustment are standard features on the pin conveyor. Automatic width adjustment of the pin conveyor, based on the parameter settings for specific reflow programs, is available as an option. For processing of larger PCBs at higher lead-free temperatures, a center support system is available to prevent board warpage.
Conveyor speed is programmable from 400-1800 mm (16″-71″) per minute to accommodate any process requirement.
While the debate over air or inert reflow atmospheres continues, as an option, offers the S-R1000 in a nitrogen-compatible configuration for manufacturers who want the flexibility for soldering in both environments.
Most experts agree that the reduction of oxygen through the introduction of an inert gas (usually N2) will allow a wider process window and provide better solder joints through reduced oxidation. The enhanced flow design of the heating chamber in the S-R1000 nitrogen compatible system lends itself to efficient heat transfer and ensures low nitrogen consumption while maintaining O2 levels between 300-1000 ppm.
Because the higher liquidus temperatures required by lead-free solders approach the limits of many SMT components and PCB assemblies, more aggressive cooling is often required to reduce peak temperature exposure times. Some recent studies also indicate that cooling rates have a significant effect on solder joint grain structure.
For these reasons, an internal water-chilled recirculating cooling system is available for the S-R1000. It allows users to alter cooling rates to meet solder paste manufacturers recommendations to a much greater degree than is possible with the exclusive use of air cooling.
Operation and control of all reflow systems is accomplished through an attractive, colorful, visual user interface that features a full-screen, virtual view of the system with display of pre-set and actual zone temperatures, system status and conveyor speed.
The Windows-based operating system and control software includes advanced functions for temperature profiling, timed automatic startup and shutdown, audible and visual alarms, and password protection.
A PC-controller with 15″ flat screen monitor, keyboard and trackball allow unlimited storage and networking capability.
All systems employ UPS battery backup to ensure removal of all product from the oven in the event of a power outage.
Axial Sequencer – The axial sequencer machine takes axial leaded through-hole components from reels and creates a tape chain of components in order of insertion for use on the axial insertion machine.
Component Lead Hole Guidelines
PCBs should be punched or drilled for component lead insertion to the following recommended hole diameters for optimum performance:
Hole Diameter = Lead Diameter + 0.48 mm (0.019 in.) ± 0.08 mm (0.003 in.)
Hole sizes:
• Less than recommended – Might result in reduced insertion reliability
• Greater than recommended – Might result in loose components in the PCB
Holes used for board error correction should be 1.0 mm (0.040 in.) ± 0.5 mm (0.020 in.). Plated holes or translucent PCBs might affect performance
2015 new designed LED light board pick and place assemble machine :
Mounting head: Double arm, 36 pieces sucking mouth, 18 pieces sucking mouth per arm
Min mounting distance: 13.5mm
Driving motor of mounting head(Y axis): Principle motor(magnetic), 15% faster than servo screw motor
Mounting range: 0805,1206,2121,2835,3014,3528,5050,5630,5730,RGB and other LED belt light
Theory mounting speed: 70K CPH*2=140K CPH
Working mounting speed: 60K CPH*2=120K CPH
PCB sizes:1200MM(L)-300MM(W)
Feeder amount: 18 feeder(8mm)*2=36 feeders,electronic feeder
Vibrating disc, for bulk material: Can be customized, vibrating disc can be changed with FEEDER, and the
working speed is the same
Dimension(L*W*H): 2650*1650*1350mm
Total weight: 2000kg
Application: 0.3-1.2 meter LED daylight tube and soft light belt include RGB strip light, LED panel light etc
| Model | Pick and place speed | Overall sizes( L*W*H) | Weight |
| S-K100 Belt LED SMD | 120K CPH | 2650*1650*1350mm | 2000kg |
| S-K200 Belt LED SMD | 180K CPH | 2650*1750*1400mm | 2500kg |
| S-K100VP Bulk LED SMD | 80K CPH | 2650*1650*1350mm | 2000kg |
Fully automatic electric feeder, can set the feeding design according to your mounting needs through the computer:
Double module mounting head, each module has 16 pieces sucking head:
South Korea magnetic motor, guarantee high mounting speed, easy to maintain:
Top performance industry computer, can be folded into the machine, easy to set placing design:
Skoda alarm, let you know the pick and place machines working condition clearly:
PCBA Auto Insertion – Axial, DIP, Radial, Pin, Odd-Form
The primary sources for (new) automated through hole component insertion or through hole component assembly equipment today, are: Contact Systems, Fuji, Panasonic, TDK and Universal Instruments. All (5) OEMs have contributed to the advancements in equipment and technology that we use today to assemble printed circuit boards, and all provide spare parts and varying levels of technical support.
Contact System’s semi-automatic component insertion systems are capable of processing a wide range of components, including: axial, radial, dip, sip and even many odd-form devices. Although Contact’s machine are most commonly used to augment fully automatic assembly processes, it is not unusual to see the Contact Systems CS 400D and CS 400E component locators being used as the primary means of assembling printed circuit boards at many low to moderate volume manufacturing facilities. All CS 400 systems are ergonomically designed to minimize operator fatigue and maximize productivity by combining a convenient operator to machine interface with several types of parts delivery systems, including their: CS 210 Rotary Bin, CS 400LPD – Large Parts Dispenser, CS 241 Lighted DIP Dispenser and the CS 740 JIT Component Delivery Systems which are available in single ( CS 740BS ) and double picker ( CS 740BD ) configurations.
Contact System’s Ultra Clinch offers the unique feature of allowing the user to program lead lengths and clinch angles for each and every component being assembled.
Component insertion rates of 600 pph to 1,500 pph are typical.
Universal Instruments Corporation manufactures a complete line of through hole insertion equipment. Also known as Insertion Mounted Component ( IMC ) and pin in hole assembly equipment, UIC offers automatic component insertion platforms for: Axial, DIP, Pin, Radial, SIP, LED, Transistor and Odd-form devices.
Universal’s IMC line of axial component processing equipment includes:
Axial component sequencers that are available in the following models: 2596R, 2596A, 2596B, 2596C and 2596D. The expandable axial sequencers can be configured with: 20 to 220 stations using (20) station add-on modules, expanded range verifiers (ERV), refire, pass-thru or single board transfer – SBT . The typical yield rate of a Universal sequencer ranges from 12,000 pph to 25,000 pph.
To compliment the 2596 sequencer, Universal offers the following axial component insertion systems: 6285, 6287, 6287A, 6287B, Generation 8, VCD single head 8 and model 6295 dual head VCD. Other VCD based inserters include the Jumper wire single head 8 and Jumper wire dual head 8. The cycle rates of these machines range from 8,500 pph to 40,000 pph depending on their configuration and vintage. Aside from cycle rates their operating parameters are similar.
As an alternative to stand alone equipment, Universal also offers a combined sequencer/inserter for axial leaded devices. Referred to as: 6241, 6241A, 6241B, 6241C, 6241D, 6248/48F, VCD Sequencer 8 Inserter, these axial lead sequencer / inserters can be configured with the same features as stand alone equipment.
Universal’s DIP Inserter product line include: Uni-module, Multi-module and SIP platforms. Available options include: 4 Pin DIP LED Tooling, DIP/Socket tooling, Autostick, and Single Board Transfer. The single head Uni-mod or model 6796 will typically yield 2,500 pph to 3,200 pph. The dual head Multi-mod or model 6772 typically yields 3,400 pph to 4,200 pph.
Universal’s Radial Sequencer/Inserter product line inserts radially taped and reeled components with body diameters up to 13mm and lead spans of 2.5/5mm at speeds ranging from 6,500 pph to 11,000 pph. Often referred to as Rad 1, Rad 2, Rad 3, Rad 5 and Rad 8 machines, these platforms can be configured with: 20 to 80 stations, single board transfer – SBT and expanded range verifiers – ERV. Model numbers associated with the Radial products include: 6346, 6348, 6358, 6360 and 6380.
Fuji, Panasonic Factory Automation and TDK offer competitive products, including: Fuji’s Flexible Board Assembler – FBA, Panasonic’s RH & AV and TDK’s RH.
| Nuts | |||
| 42519400 | Hex Nut | * | |
| 42519500 | Hex Jam Nut | * | |
| 42519600 | Hex Nut – Machine Screw | HEXNUT-MS | |
| 42519700 | Hex Nut – Small Pattern | HEXNUT-SP | |
| 42519800 | Hex Nut – Metric | * | |
| 42519900 | Hex Nut – Nylon | HN-N | |
| 42555700 | Hex Nut – Left Hand Thread | HN-LHT | |
| 42520000 | Square Nut – Standard | SQNUT-STD | |
| 42520100 | Square Machine Screw Nut | SQMSNUT | |
| Socket Button Head Screws | |||
| 42520200 | Socket Button Head Screw | SBHS | |
| 42520300 | Socket Button Head Screw | SBHS-NP | |
| W/Nylon Patch | |||
| 42520400 | Metric Socket Button Head | MSBHS | |
| Screw | |||
| Hex Head Screw | |||
| 42520500 | Hex Head Cap Screw | HHCS | |
| 42520600 | Hex Head Machine Screw | HHMS | |
| 42521200 | Metric Hex Head Machine | MHHMS | |
| Screw | |||
| 42522100 | Lag Screw | LAG SCR | |
| 42555300 | Hex Head Cap Screw – Full | HHCS-FTHD-SMHD | |
| Thread – SMHD | |||
| Socket Head Cap Screws | |||
| 42520700 | Socket Head Cap Screw | SHCS | |
| 42520800 | Socket Head Cap Screw | SHCS-NP | |
| W/Nylon Patch | |||
| 42520900 | Socket Head Cap Screw | SHCS-SS | |
| Stainless Steel | |||
| 42521000 | Socket Head Cap Screw | SHCS-LH | |
| Low Head | |||
| 42521100 | Metric Socket Head Cap | MSHCS | |
| Screw | |||
| 42521300 | Socket Head Cap Screw | SHCS-N | |
| Nylon | |||
| 42554900 | Metric Socket Low Head Cap | MSLHCS | |
| Screw | |||
| Flat Head Screws | |||
| 42521400 | Flat Head Machine Screw | FHMS | |
| 42521500 | Flat Head Wood Screw | FHWS | |
| 42521600 | Socket Flat Head Screw | SFHS | |
| 42521700 | Socket Flat Head Screw | SFHS-NP | |
| W/Nylon Patch | |||
| 42521800 | Metric Socket Counter Sink | MSCS | |
| Screw | |||
| 42521900 | Flat Head Self Tap Screw | FHSTS-TA | |
| Type – A | |||
| 42522000 | Slotted Flat Head Screw | * | |
| Nylon | |||
| 42555400 | Flat Head Thread Cutting | FHTCS | |
| Screw | |||
| 42555600 | Flat Head Machine Screw 100 | FHMS-100 DEGREE | |
| Counter Sunk | |||
| Pan Head Machine Screw | |||
| 42522200 | Pan Head Machine Screw | PHMS | |
| 42522300 | Pan Head Self Tapping Screw | PHSTS-TA | |
| Type-A | |||
| 42522400 | Pan Head Self Tapping Screw | PHSTS-TF | |
| Type-F | |||
| 42522500 | Metric Pan Head Machine Screw | MPHMS | |
| 42522600 | Pan Head Screw – Nylon | PHS-N | |
| 42555000 | Pan Head Self Tapping Screw | PHSTS-T25 | |
| – Type 25 | |||
| 42555500 | Pan Head Thread Cutting Screw | PHTHCS | |
| Round Head Screws | |||
| 42522700 | Round Head Drive Screw | RHDS-TU | |
| – Type U | |||
| 42522800 | Round Head Machine Screw | RHMS | |
| 42522900 | Round Head Wood Screw | RHWS | |
| 42566000 | Round Head Square Neck Bolt | RHSNB | |
| Set Screws | |||
| 42523000 | Socket Set Screw Cone Point | SSSCNP | |
| 42523100 | Socket Set Screw Cup Point | SSSCPP | |
| 42523200 | Socket Set Screw Cup Point | SSSCPP-NP | |
| W/Nylon Patch | |||
| 42523300 | Socket Set Screw Flat Point | SSSFP | |
| 42523400 | Socket Set Screw Half Dog Point | SSSHDP | |
| 42523500 | Socket Set Screw Knurl Cup Point | SSSKCPP | |
| 42523600 | Socket Set Screw Oval Point | SSSOP | |
| 42523700 | Socket Set Screw Cup Point | SSSCPP-SS | |
| Stainless Steel | |||
| 42523800 | Metric Socket Set Screw Cup Point | MSSSCP | |
| Shoulder Screws | |||
| 42523900 | Socket Head Shoulder Screw | SHSS | |
| 42524000 | Metric Socket Shoulder Screw | MSSS | |
| 10463000 | Shoulder Screws | * | |
| Washers | |||
| 42524100 | Flat Washer | FW | |
| 42524200 | External Tooth Lock Washer | ETLW | |
| 42524300 | Internal Tooth Lock Washer | ITLW | |
| 42524400 | Split Lock Washer | SLW | |
| 42524500 | Metric External Tooth Lock Washer | MITL | |
| 42524600 | Metric Flat Washer | MFW | |
| 42524700 | Flat Head External Tooth Lock | FHETL | |
| Washer | |||
| 42524800 | Split Lock Washer, Black | SLW-BLACK | |
| 42524900 | Flat Washer, Black | FW-BLACK | |
| 42555100 | Machine Screw Flat Washer | MS-FW | |
| Pins | |||
| 42525000 | Standard Dowel Pin | SDP | |
| 42525100 | Oversize Dowel Pin | ODP | |
| 42525200 | Pull Dowel | PD | |
| 42525300 | Dowel Pin – Pic | DP-PIC | |
| 42525400 | Spring Pin | SPRG PIN | |
| 42525500 | Taper Pin | * | |
| 42525600 | Metric Standard Dowel Pin | MSDP | |
| 42525700 | Metric Spring Pin | MSP | |
| 42555200 | Spirol Pin – Pic | SP-PIC | |
| Inserts | |||
| 42525800 | Heli-coil Insert | * |
“Intrinsic
availability” is the percentage of time that a machine would operate
based on downtime attributed to relevant interrupts and active repair or
recovery only.
IA = Productive time / (Productive time + Repair time) *100%
Field studies
indicate that Intrinsic Availability typically ranges from 95% to 99%. A
95% Intrinsic Availability means that 95% of the time the machine runs
without requiring operator intervention, beyond normal tasks such as
loading components. Five percent of the time requires operator
attention. 95% Intrinsic Availability translates into 24 minutes of
unexpected down time during an 8-hour full production shift. “Full
production” excludes scheduled maintenance, operators breaks, set-ups.
Intrinsic Availability does not affect board quality, but it does impact
throughput and utilization.
Customer ____________________________________ Date _____________________________
Old Serial Tag # _______________________________ Equip # __________________________
Prod Code _____________ Description __________________________________________
Qty _______ RMD Identifier # _______ Ord # _____________ Prod Order # _______________
Builder Name/Initial ________________________________________ Clock # __________
QA Technician Name/Initial __________________________________ Clock # __________
Shipping Clerk Name/Initial __________________________________ Clock # __________
1. Turn For Final Inspection Builder/QA Tech
A. Leveling legs are correct type (standard pass thru ______________
height or special).
B. Conveyor speed verified mode functions and board ______________
sensors set and operational.
C. Parallelism of rails set. ______________
D. Input voltage correct to order requirement. ______________
E. Conveyor length correct to order requirement. ______________
F. Board flow direction is to order requirement. ______________
2. Visual Inspection Builder/QA Tech
A. Check for dents, scratches and poor painting. ______________
B. Check for loose hardware. ______________
C. Interfacing hardware including. ______________
D. Covers installed. ______________
E. Cables installed or packed in carton. ______________
3. Pre-Shipment Builder/Ship Clerk
A. Run Delivery Note. ______________
Builder/Ship Clerk
B. Verify all items on order are present. ______________
C. Properly package all items in carton(s) and/or power ______________
pack(s).
D. Fill out box content sheet. ______________
E. Label carton(s\) and/or power pack. ______________
F. Notify shipping clerk. ______________
4. Close Out Procedure Builder/Shp Clerk
A. Review Delivery Note with shipping clerk. ______________
B. Turn machine over to shipping clerk. ______________
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STEP & DESCRIPTION |
Builder |
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Check base casting build. |
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Thompson shaft oriented torqued and lubed with 10w oil. |
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Leveling pads mounted but not tightened. |
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Foam insulation in place. |
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Check y & x frame build. |
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Bearings & retainers mounted |
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Verify the x & y bearing preloads are set. |
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Limit rails and limit blocks mounted and activate limit switches. |
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Tie clamps mounted. |
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All brass pneumatics fittings installed. |
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Insure base, y frame, and x frame are mated together. |
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Check build & installation of x & y paddles. |
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Hardware tight dowels in place. |
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Bearings installed. |
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Check x & y table movement. |
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Ball screw units installed and lubed. |
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Motor, drive belt installed with proper belt tension adjusted. |
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Rotary disc installed. |
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Wheels mounted with proper hardware and internal tooth CSK. |
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Lock assy & drive motor installed & adjusted. |
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Wheel cams adjusted so dowel pins fit through disc bushings into the x-frame bushings. |
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