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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Lincoln SP-135T feed problem
I have a new Lincoln SP-135T that does not want to feed wire anymore.
Today I loaded the supplied spool of wire (Lincoln L-56, .025), feed the wire till it came out of the gun, installed the tip (.025) and nozzle then connected the shield gas setup. Everything was going great until I started welding. After about an inch bead the wire stopped feeding. I was just putting down a bead on some flat steel stock. The wire was still poking out of the tip about 1/8 inch. I opened the side panel not knowing what to expect but nothing looked out of place. I pulled the trigger a couple of times and the feed roll moved very little, I tried this over the entire range of feed speeds and the feed roll never moved more that a degree or two. I released the spring loaded pressure arm and was able to push the wire by hand through the gun with minimal force. Note that there is almost no pressure on the wire spool, I'll tighten this up a bit when I get the feed issue taken care of. I also checked to make sure I was using the proper groove in the feed roll. With no pressure on the drive roll I pulled the trigger and the drive roll rotated in jerks. What's up with that? After alot of looking around I decided to remove the drive roll. With the drive roll removed I pulled the trigger and the drive roll shaft rotated like a champ. I tried this at different speeds and the drive motor seems to work. I reinstalled the drive roll and were back to jerky rotation. After looking around some more I slipped some paper between the drive roll and the wire , note this is with no pressure on the drive roll, and the drive roll rotates just fine. It seems that the drive motor will not work if the wire is touching the drive roll. I'm out of ideas on this one. Any thoughts on this issue problem would be appreciated. Thanks, Jesse |
#2
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Lincoln SP-135T feed problem
Feed-speed control checked; probably not the problem
Cable and gun checked; probably not the problem Wire spool tension low; backlash possible but not the problem Jerky motion of drive roll; drive motor will not work if the wire is touching the drive roll. Suggest that spring pressure is too great on the drive roll, causing motor shaft to bind. The spring pressure should be LOW enough so that if the wire jams in the contact tip, the wire will slip in the drive roll and avoid bird-nesting between the drive roll and the entry into the cable. Recommendation: - Rewind all the wire onto the feed spool and secure to avoid unwinding. Remove feed spool from the machine. Remove contact tip. - Ensure wire entry to drive roll area is clean. - Close the pressure arm and reduce spring pressure to minimum. - Pull trigger to verify correct feed operation of drive roll. - Replace feed roll and re-thread wire through drive roll, cable and gun. - Pull trigger to verify that wire is driven and drive roll runs smoothly (no jerkiness in motion). - If the jerkiness persists in the drive roll, motor or drive roll bearings may be damaged. - If the wire does not move, increase the spring pressure slightly. You should be able to hold the gun against a hard surface (not a body part) to prevent the wire from exiting the gun and the wire should slip in the drive roll without bunching-up inside the machine (bird nesting). Once the feeding is smooth, replace the contact tip and resume welding. On 16 May 2004 17:20:13 -0700, (jessem) wrote: I have a new Lincoln SP-135T that does not want to feed wire anymore. |
#3
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Lincoln SP-135T feed problem
I have a new Lincoln SP-135T that does not want to feed wire anymore.
Today I loaded the supplied spool of wire (Lincoln L-56, .025), feed the wire till it came out of the gun, installed the tip (.025) and nozzle then connected the shield gas setup. Everything was going great until I started welding. After about an inch bead the wire stopped feeding. I was just putting down a bead on some flat steel stock. The wire was still poking out of the tip about 1/8 inch. I opened the side panel not knowing what to expect but nothing looked out of place. I pulled the trigger a couple of times and the feed roll moved very little, I tried this over the entire range of feed speeds and the feed roll never moved more that a degree or two. I released the spring loaded pressure arm and was able to push the wire by hand through the gun with minimal force. Note that there is almost no pressure on the wire spool, I'll tighten this up a bit when I get the feed issue taken care of. I also checked to make sure I was using the proper groove in the feed roll. With no pressure on the drive roll I pulled the trigger and the drive roll rotated in jerks. What's up with that? After alot of looking around I decided to remove the drive roll. With the drive roll removed I pulled the trigger and the drive roll shaft rotated like a champ. I tried this at different speeds and the drive motor seems to work. I reinstalled the drive roll and were back to jerky rotation. After looking around some more I slipped some paper between the drive roll and the wire , note this is with no pressure on the drive roll, and the drive roll rotates just fine. It seems that the drive motor will not work if the wire is touching the drive roll. I'm out of ideas on this one. Any thoughts on this issue problem would be appreciated. Thanks, Jesse A wild a$$ guess would be that somehow the welding voltage is getting fed back into the drive motor for the wire... I believe, if looked at closely, you will find insulating plates, washers, etc., to provide the isolation needed. Maybe something shifted, got loose or whatever. I would check both the spool side and remove the cover to check the "back side" where the drive motor is located. HTH Ken. |
#4
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Lincoln SP-135T feed problem
"jessem" wrote in message om... I have a new Lincoln SP-135T that does not want to feed wire anymore. You have a guarantee. I would load it up and take it to the service center. They will fix it, or let you know what the problem is. If you work on it, you could void your warranty if it is something internally wrong with it, and not something simple. You paid good money for it. It should work right. Steve |
#5
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Lincoln SP-135T feed problem
"jessem" wrote in message . com... I have a new Lincoln SP-135T that does not want to feed wire anymore. You have a guarantee. I would load it up and take it to the service center. They will fix it, or let you know what the problem is. If you work on it, you could void your warranty if it is something internally wrong with it, and not something simple. You paid good money for it. It should work right. Steve Sorry..... I overlooked the word "new".... sigh.... Ken. |
#6
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Lincoln SP-135T feed problem
"Ken Sterling" wrote in message s.com... "jessem" wrote in message . com... I have a new Lincoln SP-135T that does not want to feed wire anymore. You have a guarantee. I would load it up and take it to the service center. They will fix it, or let you know what the problem is. If you work on it, you could void your warranty if it is something internally wrong with it, and not something simple. You paid good money for it. It should work right. Steve Sorry..... I overlooked the word "new".... sigh.... Ken. I was at the Delco Drags last October here in Las Vegas. I was at the Lincoln semi trailer hammering for a good price on a Square Wave 175. I told the tekkie that I had a SP175+ wirefeed that had a defective trigger or contact. Sometimes it just wouldn't feed until I opened up the hatch and wiggled the wires. In a deep Carolina mountain drawl, he said, "Well, dang, buddy. Ya got a three year guarantee. Take the durn thing to the Repair Center, and get it fixed for free." I still have to wiggle the wires once in a while. Maybe one of these days I will take it to the durn Repair Center before three years passes. Steve |
#7
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Lincoln SP-135T feed problem
"jessem" wrote in message om... I have a new Lincoln SP-135T that does not want to feed wire anymore. Today I loaded the supplied spool of wire (Lincoln L-56, .025), feed the wire till it came out of the gun, installed the tip (.025) and nozzle then connected the shield gas setup. Everything was going great until I started welding. After about an inch bead the wire stopped feeding. I was just putting down a bead on some flat steel stock. The wire was still poking out of the tip about 1/8 inch. I opened the side panel not knowing what to expect but nothing looked out of place. I pulled the trigger a couple of times and the feed roll moved very little, I tried this over the entire range of feed speeds and the feed roll never moved more that a degree or two. I released the spring loaded pressure arm and was able to push the wire by hand through the gun with minimal force. Note that there is almost no pressure on the wire spool, I'll tighten this up a bit when I get the feed issue taken care of. I also checked to make sure I was using the proper groove in the feed roll. With no pressure on the drive roll I pulled the trigger and the drive roll rotated in jerks. What's up with that? After alot of looking around I decided to remove the drive roll. With the drive roll removed I pulled the trigger and the drive roll shaft rotated like a champ. I tried this at different speeds and the drive motor seems to work. I reinstalled the drive roll and were back to jerky rotation. After looking around some more I slipped some paper between the drive roll and the wire , note this is with no pressure on the drive roll, and the drive roll rotates just fine. It seems that the drive motor will not work if the wire is touching the drive roll. I'm out of ideas on this one. Any thoughts on this issue problem would be appreciated. Thanks, Jesse make sure the reversible dual groove wire drive roller is set for .025" wire and not .030" wire. That might make the wire slip like that. just an idea. walt |
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Lincoln SP-135T feed problem
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Lincoln SP-135T feed problem
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