Making an adjustable belt tensioning device to tension a toothed belt. Turning a plastic sleeve to fit the bearing and fitting an offset bush into the bearing.
G’day Alan, coming along nicely. I first thought the plastic would heat up and slide off but then remembered it’s a dividing head, it doesn’t rotate at speed it only turns a division of one turn unless you’re cylindrical grinding but then it needs only to be slow. Cheers Peter
Nicely done Alan. I have found that HSS tooling does a much better job on synthetic material. Inserts seem to push the plastic away rather than cutting it leaving a rather poor finish, they don't have the super sharp edges of home ground HSS cutters.
I probably would have made it the same way, but if you had crowned it without the sides edges, do you think that would have worked? Crowning usually "self centers" a belt but I never thought about it for a tensioner application.
G’day Alan, coming along nicely. I first thought the plastic would heat up and slide off but then remembered it’s a dividing head, it doesn’t rotate at speed it only turns a division of one turn unless you’re cylindrical grinding but then it needs only to be slow.
Cheers
Peter
Nicely done Alan. I have found that HSS tooling does a much better job on synthetic material. Inserts seem to push the plastic away rather than cutting it leaving a rather poor finish, they don't have the super sharp edges of home ground HSS cutters.
Gday Alan, this is coming along nicely, great work and thank you for sharing, ATB Matty
I Tryed that a while ago and found the heat of the bearing made the material I used go soft, so ended up making another one out of aluminum.
Nice Adjustment.
Kudos Allen!
Cool work 👍👏
alan, very nice. poppy's workshop says HI
Should try a left hand to get the chuck clean
I probably would have made it the same way, but if you had crowned it without the sides edges, do you think that would have worked? Crowning usually "self centers" a belt but I never thought about it for a tensioner application.
Hi Tom don’t forget the belt moves slow a little at a time so a crowned pulley might not work
Thanks for watching
Alan
How many millimeters off-center is the cam?
Hi Dorian. The hole offset is 6mm which should give 12mm of adjustment on the belt. But if you have a larger bearing bore you could make it more.
enjoyed