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Discussion Starter · #1 ·
I have an old (35 years) Scheppach thickness and surface planer, (250 mm) which is still working excellently, and has done so for the last 16 years that I've had it. About 8 years ago I needed to replace 2 of the gears in the roller drivetrain, which I obtained from Scheppach in Germany. I noticed that the material on the clutch plate was quite worn, and I decided to replace it with a ring of suede leather, which I carefully cut out and bonded to the plate with contact adhesive.

All went well for a few years, or so I thought! A couple of years ago I noticed that the rollers were still turning when the clutch was disengaged while surface planing. I opened up the drivechain and found the clutch pair were firmly bonded together. I put it all back to for another day, as it wasn't causing an operational problem, and I had more urgent things to concern me.

Well with lock-down, "another day" has arrived! I decided to tackle the clutch, and with great difficulty I managed to separate the components, and found that the leather was all scrunched up, and that some sort of gunk was binding the shaft that the plate moves on. Now it is all cleaned up, and moving beautifully on the shaft. But of course, now I have no means of engaging the clutch.

I realise that I will have to find someone who can professionally bond the right sort of material to the plate, but until things open up here, that's not likely to happen. So I am hoping that someone might be able to suggest a temporary fix for me - or am I "clutching" at straws?

Picture attached
 

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Surely there is some sort of auto motive or industrial clutch material you can apply. Something that will let you ‘cut’ it into shape - or bond pieces around the surface to give enough contact for a good grab. Possibly some industrial grade tanned leather would work again if it is stout enough to handle the wear. Interesting challenge...
 

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Permatex makes gasket "goop" that is resistant to high temperatures. I'm pretty sure it will handle the shear strength required to hold the clutch material.

They make different stuff so you'll need to check the specs but the stuff I'm thinking of cures hard and very difficult to take apart.

Two-part epoxy might work but it might not handle the heat and might break down if hot enough. I'm not familiar with the amount of heat your clutch might generate from friction...either might do the trick.

And then there's the stuff they use to bond pads on disc brakes...forgot what that is called...sorry
 

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@Wildwood

Take a look at these products also...

Permatex Ultra High Temp Copper RTV is good to 700*F.

Rutland Seal it Right 800-Degree Latex, 10.3-Ounce Cartridge, Black for about $15 a full size calking tube.

Cotronics has

Durabond 7025 1000*F Aluminum Putty, and
Durabond 7032 2000*F Stainless Putty (has "excellent adhesion" and is machinable)
 
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Discussion Starter · #5 ·
Thank you for the suggestions. Scratching around my adhesive box, I found some 2 part Pratley Wondafix, which is a flexible product, and they even mention friction drives in the blurb. I have applied some to a metal surface to assess its adhesion and final 'feel', but need to wait 24 hrs for full cure. I don't believe that the drivetrain gets very hot at all -at least not when it is functioning correctly - if the clutch were to slip, it would probably get hot.

I will report back on my test, and if i am happy I will try it out on the clutch plate.

Thanks again for the suggestions.
 

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Thank you for the suggestions. Scratching around my adhesive box, I found some 2 part Pratley Wondafix, which is a flexible product, and they even mention friction drives in the blurb. I have applied some to a metal surface to assess its adhesion and final 'feel', but need to wait 24 hrs for full cure. I don't believe that the drivetrain gets very hot at all -at least not when it is functioning correctly - if the clutch were to slip, it would probably get hot.

I will report back on my test, and if i am happy I will try it out on the clutch plate.

Thanks again for the suggestions.

Good luck with it...there's also HH-66 repair cement...useful for lots of stuff around the house, boat, etc... It's a contact cement with strong bonding properties...
 
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I don't know if this might help you but it is a place to look Mcmaster Carr clutch material.

https://www.mcmaster.com/friction-material/

Years ago I worked at a machine shop where we relined out of production automotive clutches and obsolete brake shoes but all our stuff was riveted on so I am no help on adhesives
I wish you luck you should be able to find something. Maybe talk to a local machine shop in your area.
 

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Discussion Starter · #8 ·
Success at last - (at least I think so)

I did some tests with the Pratley Wondafix, and the results looked good - I applied it to the clutchplate and let it cure 24 hrs. I have now re-installed, and everything is working as it should. The clutch engages with no sign of slipping, and now for the first time in years, also disengages.

So thanks again for all the suggestions - I might need to re-visit some of these if this fix doesn't prove long-term.
 

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That's wonderful news...now get back to work...! :grin:
 
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@Wildwood

Are you using the Wondaflex as the clutch material or did you use it to bond material with it...?
 

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Discussion Starter · #11 ·
@Nickp

Are you using the Wondaflex as the clutch material or did you use it to bond material with it...?
Nick, I'm using the Wondafix as the actual clutch material - it mentions friction drives as one of its uses, and my tests gave excellent adhesion results on metal. and the cured surface has a bit of 'give' in it, so I'm hopeful for long term results.
I will be doing a lot of planing in a couple of weeks time, and that will be the acid test. I will certainly report back, (for better or for worse!)
 

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@Nickp



Nick, I'm using the Wondafix as the actual clutch material - it mentions friction drives as one of its uses, and my tests gave excellent adhesion results on metal. and the cured surface has a bit of 'give' in it, so I'm hopeful for long term results.
I will be doing a lot of planing in a couple of weeks time, and that will be the acid test. I will certainly report back, (for better or for worse!)

It seems that as an adhesive it would be used to bond the friction material for any drives that engage and disengage, like your recent leather material. Your drive is likely to require some slippage before completely engaging and I wonder if Wondafix will allow it to do that.

I surely hope it works but I would take a look at the engaging surface every few times you use it.

Best luck...let us know how it goes...
 
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Discussion Starter · #13 ·
An interim update on the clutch material. I have now put through a great deal of White oak and Australian Blackwood, and not the slightest sign of slipping. I have a lot more Blackwood to get through in the next month, and after that I will strip the drive train and examine the clutch plate, and post a pic. But so far I believe that this stuff is the goods!
 
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