lathe belt

[blowlampParticipant @blowlamp]

Posted by Dinosaur Engineer on 07/12/2010 16:00:42:

Maybe the toothed belt is used due to a small pulley being used  ( high torque at small radius) and the pulley wheel centres are close so that it’s difficult to provide enough “wrap around” for a ‘V’ belt. A friction belt would be better than a “geared” belt as it’s more likely to slip rather than cause mechanical damage. The equivalent ‘ v ‘ belt drive would probably need more space and/or a tensioning roller to increase the small pulley “wrap around” 

 

 

 I agree with all of that and would say that if a small ‘toothed belt’ drive pulley is used, then that is probably a bad thing in this instance, as the belt will be prone to shedding its teeth.

Poly-V belts are much better under these circumstances, due to their slim construction and will wrap around smaller pulleys than other V-belts, but do need to be properly tensioned.

If the lathe in question has inadequate tensioning arrangements then that might be why the maker went with a toothed belt design, as it is more forgiving if left loose.

Almost all other manufacturers use V-belts of one style or another.

 

Martin.

[TerrydParticipant @terryd72465]

Hi Dinosaur and Blowlamp,

 

Those are very likely to be a couple of the reasons for hte decision to use these belts.  Dinosaur surely the slip factor is built in to the other (vee) belts from the countershaftand if Poly bets were used with their better grip it would tend to decrease the safety factor element.?

 

Regards

Terry

[Gordon WParticipant @gordonw]

Just for interest:_ Have now got a new toothed belt for my Chester DB8 lathe. Well bought 2, following up suggestions on this forum, from Lathemaster in Baton Rouge US. Very helpful man, only prob. was Royal Mail charging £11.90 “handling fee”. Pity I couldn’t have got one from Chester.

[ncdParticipant @ncd]

Hi,

Just as an update to this – I also tried to get the belt for my DB8 from Chester who were very helpful but it seems there may be two designs of DB8 out there. they very kindly offered to source one for me but I chose to try locally first.

 

Mine uses the older style wide belt which I bought from http://www.brammer.co.uk in case anyone else faces this in the future.

 

Cheers,

N

[Ron ShawParticipant @ronshaw11131]

This was interesting as i have the db10g and same issue, want spare belt, mine listed in manual as an M1.5xZ124

Can you give me the part no for the ones you bought?

Also i love the lathe so would like to mod pulleys if these belts cant be readily found as it would seem

Hoping we can keep this alive

Ron

[mahgniaParticipant @mahgnia]

C6 spare part:

**LINK**

C6-944 Timing belt from Arc-Eurotrade 1.5 x 124 x 15

 

Andrew

Edited By mahgnia on 23/09/2015 15:30:25

[Ron ShawParticipant @ronshaw11131]

Thanks a bunch there Andrew!!

Great link mate
cheers
Not same lathe as mine but parts like belts same though

Edited By Ron Shaw on 23/09/2015 22:46:55

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