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ML7 lost drive

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AJW	28/07/2018 19:15:38
388 forum posts 137 photos	Using my ML7 this afternoon turning at a large diameter the chuck stopped. This is usually caused by the mandrel belt slipping as I don't have it that tight, but it wasn't, the belt/pulley was still being driven! It would appear that the stepped mandrel pulley drives the smaller (brass) gear I am guessing that there is an interference fit within which has now failed (been ok for the last 60 years!) Obviously a strip down is on the cards and I'm guessing the drive could be restored possibly with 'loctite'? Anyone else encountered this problem? Alan
JasonB	28/07/2018 19:20:56
25215 forum posts 3105 photos 1 articles	Few similar posts like this one will help
AJW	28/07/2018 19:39:40
388 forum posts 137 photos	Thanks for that, it is as I suspected, no longer enough of an interference fit! Alan
John Olsen	29/07/2018 03:38:17
1294 forum posts 108 photos 1 articles	I had that happen on my ML7 some years back. It does not help that the standard V belts make the alloy pulley run quite hot. I ended up changing it over to a poly V belt. While I was about it I made a four step pulley instead of 3. Hemingways have a kit for ploy V belt to a Super 7 but that is not applicable for an ML7. Maybe I should write up what I did. John
AJW	29/07/2018 10:03:47
388 forum posts 137 photos	Thanks John, I agree the pulley does run warm and perhaps with the warmer weather it took it beyond the point of no return! I can still use it on 'normal' stuff but working on a 3 inch diameter highlighted the problem. Alan
AJW	01/08/2018 20:06:56
388 forum posts 137 photos	Dismantled the headstock today and had to heat the pulley to get it off the gear - it was still a good fit! All cleaned up and degreased then assembled with Granville 'bearing fit' Seems to have done the job, time will tell! Alan

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