GC 0302 Casting Damage

[Framsden]

I bought a few machines that fell over and suffered some damage. This Kingmax 0302 looks almost new or has very little use but the casting broke on the front “leg”. See pics. It sews fine and the shaft seems to be solid. Thoughts?

 

[R8R]

If it sews it sews but when things go wrong that you can't tune out of the machine at least you will know the culprit.

Maybe pull the shaft out and take it to a local welder to see if the broken piece can be brazed back on. (or tig welded). Should not be an expensive fix.

Edited September 27, 2018 by R8R
spelling

[Constabulary]

if the broken off pice causes no technical problems I would glue with a good epoxy like JB KWIK Weld. I did that twice. Drill some holes in casting and the broken off piece fill them with JB Weld press in a bit smaller dowel pins put some extra JB and press the parts together. Advantage - don´t have to rip apart the machine no need to apply heat and no grinding off welding seams, its fast and a cost efficient DIY

my 2 cents

[jimi]

I would agree with Folker and his 2 cents. I had a similar problem, the difference was you have the broken part and it was a hole with a Singer thread. I usually ask some friends to weld things up but was advised this time to epoxy fix instead. The reason being was due to the bottom flat bed might have suffered from the heat. So i drilled 4 holes approx 3-4mm in diameter and inserted stainless steel threaded rods with some JB weld, then made a wall around with a plastic sheet and filled it up until i got the height of the foot. The hole where the thread went was plugged with a wax dowel as i had half the thread there and was in line with the other end. Once set i took out the plug and used the tap to thread the epoxy side having the the other side to guide. The thread holds and i can rest the machine on the floor no problem (machine weighs 40kg!). hope this helps.

[DonInReno]

Of course an ideal fix is to strip it and braze or hard silver solder the part back on, but you will have to repaint the bed.  As a quick fix to get it up and sewing I’d pull the bushing, degrease the bushing bore and outer part of the bushing and use a good quality epoxy to glue in the bushing and the loose part.  There appears to be fairly good surface area and a high strength epoxy would hold quite well if you can get the oil impregnated bushing clean enough to bond.  As with super oily wood, a final degreasing wipe with accitone immediately prior to assembly is your best bet.

[Framsden]

Thanks guys, mostly my thoughts as well. I have brazed and welded cast, to much heat distortion and I don't want to pull the shaft. Not sure the difficulty level but it doesn't look terrible if I have to. My only thing with the JB weld is the pieces don't fit cleanly together. My fear is when I mate the two I will have the cast bore off a bit and wear the steel bushing on the shaft. Metallurgy says that the cast should wear into shape if I'm off a little though. I will clean up the broken piece and see how it goes.

2 hours ago, jimi said:

I would agree with Folker and his 2 cents. I had a similar problem, the difference was you have the broken part and it was a hole with a Singer thread. I usually ask some friends to weld things up but was advised this time to epoxy fix instead. The reason being was due to the bottom flat bed might have suffered from the heat. So i drilled 4 holes approx 3-4mm in diameter and inserted stainless steel threaded rods with some JB weld, then made a wall around with a plastic sheet and filled it up until i got the height of the foot. The hole where the thread went was plugged with a wax dowel as i had half the thread there and was in line with the other end. Once set i took out the plug and used the tap to thread the epoxy side having the the other side to guide. The thread holds and i can rest the machine on the floor no problem (machine weighs 40kg!). hope this helps.

Nice fix!

[Framsden]

10 minutes ago, DonInReno said:

...  As a quick fix to get it up and sewing I’d pull the bushing, degrease the bushing bore and outer part of the bushing and use a good quality epoxy to glue in the bushing and the loose part.  There appears to be fairly good surface area and a high strength epoxy would hold quite well if you can get the oil impregnated bushing clean enough to bond...

Your right about the bushing. I was originally thinking that spins too. Easier fix than anticipated!