Advice on wire drive roller supplier

[jim noonan]

Hi. Am refurbishing my 20 year old sip migmate 130 using the excellent advice on the forum (though still struggling to fathom the pcb functioning...that's a hint btw for anyone with an electronics brain who is feeling generous) and want to purchase drive rollers for .8 and .6 V and knurled I.e. four x rollers. Ebay and amazon have so many and whilst pics might help to distinguish good from bad a little I'd rather use someone with an established reputation. Any suggestions please? Many thanks in advance....hope this is the most appropriate channel to post...I wasn't quite sure.

Ta

Jim

 

[stevethegrease]

Doing a search on ' three legged fuse' turns up quite a bit on SIP circuit boards. The roller is just a regular bearing with a pin through it a quick bit of measuring will give you the size, then a bearing supplier will help. The feed motors are crap really. The support for the moving arm bends allowing the roller to cant over- derailing the wire. A bit of steel strip with 2 holes placed on the screw holding the arm and going to another screw on the body of the motor will bring the arm back vertical.
https://www.ebay.co.uk/itm/384290607923?_trkparms=amclksrc=ITM&aid=111001&algo=REC.SEED&ao=1&asc=20160811114145&meid=c88172d5b775449297b22bcbd8ec90bf&pid=100667&rk=1&rkt=1&sd=384290607923&itm=384290607923&pmt=1&noa=1&pg=2334524&brand=Unbranded&_trksid=p2334524.c100667.m2042
Looks kinda familiar, ignore the size , it's the depth of the groove , its to suit .6 and .8.

 

[AKN]

Hi, I was given a Migmate 130 in summer and researched the machine finding all the popular mods, and this website as a bonus.

I’ve done the recommended upgrade to my Migmate, probably the same vintage as yours. What I did was to take the SIP circuit board out identifying the mains input to the main transformer, the connection to the wire feed motor. I fitted a 24V 6.5A power supply unit in the opposite side to the main rectifier, I needed to turn the main transformer through 90 degrees to fit it in.

I bought a PWM motor controller from eBay with a digital display of duty cycle, ok not wire speed, but it allows me to get back to a given set point reliably. I used a 20A cntact rated relay with a 24 V DC coil to switch the supply for the main welding current which also supplies the gas valve off the secondary of that transformer.

The motor controller is powered from the 24 V PSU directly and the controller out put goes to the normally open contacts of a 2 pole change-over relay the wiper (moving contact) goes to the wire feed motor the normally closed contacts are shorted to each other. [Some one suggested this to give motor braking at high wire speeds when you lift the trigger.]. The coils of both relays are wired to the 24V PSU via the trigger switch on the torch.

I’d noticed that the torch lead was fixed to the plastic frame of the wire feed unit which distorted when the lead was moved. Also owing to a euromig torch being half the price of a fixed connection one for the Migmate I’ve put a euromig socket on the unit fixed to the front panel to eliminate the flexing of the wire feed. Added advantage of making the wiring of the trigger easier. If you go down this route a I strongly recommend the Starparts ECO torch it’s excellent value and a delight to weld with. If you want any more details please ask.

 

[jim noonan]

Hi akn. . Many thanks for taking the trouble. I've done the wire feed brace and inserted a psu and relay along the lines you suggest but no display. The difference is unbelievable but sadly I did these mods after giving in and buying a new machine! Am now going to give it to a mate.
Thanks for your help

Jim

 

[AKN]

You’re welcome.