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Thread: How would you make this?
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4th Dec 2020, 11:42 AM #1Most Valued Member
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How would you make this?
A m8 wants me to make new rollers for these rockers but he also has missing or cracked roller retainers.
These are from, I think, a 1920's 6 cyl French car.
Has anyone in here got a good way of knocking these up?
I was thinking maybe making a ms punch and die and pressing them, i can see them splitting tho.
shed
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4th Dec 2020, 01:35 PM #2I break stuff...
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I'm guessing these aren't under a whole lot of load, they're just there to stop the roller floating?
One way I'd consider is to TIG weld them up out of 3 pieces - fold the channel section, and then weld the two sides on.
The other option I'd consider is assuming they're not that shape for a clearance reason, to fold a thick enough piece of flat bar into the correct U shape, then counterbore the top where the bolt goes, and cross drill through the counterbore for the split pin.
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4th Dec 2020, 02:17 PM #3Most Valued Member
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Is the item round or elongated?
If round, can a piece be turned, drilling operations performed and then finally milled to suitable dimensions, a square plug/ jig may be needed to aid in the milling.
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4th Dec 2020, 02:21 PM #4Most Valued Member
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Yes they only stop the roller sliding out.
I dont have a tig but i think fabricating them would be the best for me, I reckon i could back up the parts on copper bar and mig them then clean up the welds
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4th Dec 2020, 03:37 PM #5Gear expert in training
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4th Dec 2020, 04:59 PM #6Most Valued Member
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The retainers may not be under much stress, but they will be subject to metal on metal wear (albeit with some oil lubrication), so you will need to choose materials wisely lest the roller bore it's way through the retainer. How hard is the sample retainer?
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4th Dec 2020, 06:33 PM #7Philomath in training
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I'd be trying to hammer form them. Bend up the main U shape (without the hole), clamp that in a jig and then hammer the flanges down. If done with a ductile steel and perhaps annealed during the process, I think that would work.
Fabrication seems really fiddly for these as a first option.
Michael
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5th Dec 2020, 09:09 AM #8
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5th Dec 2020, 07:36 PM #9Diamond Member
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For a handful I'd be machining them from round (1045?) and parting off.
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5th Dec 2020, 08:22 PM #10Most Valued Member
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Thanks fella's, I think that I will see how I go with Michael's idea of folding into a U shape first, if I get snookered then I might have to try to mill them.
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6th Dec 2020, 04:39 PM #11Most Valued Member
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I got one almost made today, it still needs a bit of work filing and drilling the holes.
I folded and welded it then buffed the welds, linished it into shape and then a bit of filing.
I forgot to take photo's of how i made it but i have another to make tomorrow so i will take some then, the ones that are split i will
just weld them and clean up the welds.
The one on the left is the made one and the one on the right is the sample.
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6th Dec 2020, 09:31 PM #12Mechanical Butcher
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They might crack again?
What about making thicker section out of aluminium alloy - no heavier?
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7th Dec 2020, 04:18 PM #13Most Valued Member
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G'day Karl, the original retainers are pretty soft and easily filed, the material that I have meticulously chosen is an offcut from a
fold out clothes line that I had to shink a bit to fit it onto the side of the house a couple of weeks ago.
The original retainers are made from .75mm and this material is 1mm.
G'day nadroj, yep they might crack but they will probably outlast the hundred year old ones that are not being replaced.
Nah.... I dont want to make aluminum ones, actually I didn't even want to make these ones.... I sorta got sucked into it
...............
What I did today, I cut 2 rectangles from the rhs, after drilling a 6mm hole at the centre of them first.
I used mapp gas for the bending and .9 mig wire to add metal where there wasn't any, here are some pics of the process, the pics should explain but if not....ask
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8th Dec 2020, 12:32 AM #14Senior Member
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Mon dieu monsieur!
Have you tried UK suppliers?
I have a "vintage car" friend in the UK (he has BRITISH cars ONLY), and even though I am NOT ALLOWED to
say the "M" word, he tells me that many parts for French cars are available in the UK. He takes a
Lagonda 1935 (or so) sports car to le Mans every year - except this year! So he also has a
"French Connection."
I know a little about availability of parts for French cars in the UK as I have a 1975 Citroën
deux chevaux (2CV).
If you can't make them,I can ask him to "look around" if the Chinese bat flu restrictions have been
lifted there.
Regards,
Alan.
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