Chester DB8

[Les Jones 1Participant @lesjones1]

Hi Jason,
I think it may be better if Brian confirms this measurement by using string or tape round the two pulleys in place of the belt before he orders one.

Les.

[Michael GilliganParticipant @michaelgilligan61133]

Lots of technical detail here: **LINK**

https://www.hpcgears.com/pdf_c33/27.17-27.47.pdf

… but, if trying to ‘second source’ we still need pictures and measurements.

MichaelG.

[JasonBModerator @jasonb]

Interesting Michael, given that it now seems likely that the pitch is Pi based the PCD of the pully formula on your link would seem to suggest that it is the 2 Pi pitch as trying 1.5Pi pitch into that equation using Brian's diameters would seem not to give full teeth. Though as I said earlier it will depemd on where the measurements were take, if over the teeth then that will be different to root dia or the PCD which is between the two.

If Brian can count the pully teeth and see if they are 65/14 that would confirm a 2X belt.

Edited By JasonB on 07/01/2021 20:23:14

[Les Jones 1Participant @lesjones1]

Brian has said that a different length belt with the 1.5 pitch part of the specification seems to fit the pulleys.
(This wat in the post on the 7th at 12:40)

Les.

Edited By Les Jones 1 on 07/01/2021 20:25:43

[JasonBModerator @jasonb]

So lets assume that his measurements were the OD of the pully. Teeth are approx 1mm high so lets say the PCD is half way.

This then give PCD diameters of 129 and 27 and that works with a 1.5X belt so now we need Brian to check and see if the tooth count is 86/18

[Michael GilliganParticipant @michaelgilligan61133]

It is also important to note the location of the pitch circle [d suffix o] … which is beyond the teeth of the pulley, in the line of the reinforcing cords in the belt.

See diagram in the link

MichaelG.

[JasonBModerator @jasonb]

So that could make it more like 88/19T if we stick with the 1.5X

[Brian BassettParticipant @brianbassett83323]

Large gear is 90 teeth small gear 19 teeth

[Les Jones 1Participant @lesjones1]

Just click on the camera button. (The next to last on the top line.)
That will display your albums and the picture files in them.
Select the file you want to display in your post and click on the OK button.

Have you measured the length of the belt path round the pulleys ? This would be a good approximation to the belt length.

Edit. I have just noticed your last post that you gave the number of teeth on the pulleys. These are the same as on the DB-10G.

Les.

 

Edited By Les Jones 1 on 09/01/2021 15:40:16

Edited By Les Jones 1 on 09/01/2021 15:41:17

[Brian BassettParticipant @brianbassett83323]

[Brian BassettParticipant @brianbassett83323]

[Brian BassettParticipant @brianbassett83323]

[Brian BassettParticipant @brianbassett83323]

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Brian Bassett on 09/01/2021 18:00:15:

.

.

**LINK**

https://www.arceurotrade.co.uk/Catalogue/Machine-Spares/C1-Lathe-Spares/C1-131-Timing-Belt/C1-131-Timing-Belt-158310-C1-131

Might be a close approximation to what yours was, Brian

… or is that the one with the correct pitch but the wrong number of teeth ?

MichaelG.

Edited By Michael Gilligan on 09/01/2021 18:26:33

[Brian BassettParticipant @brianbassett83323]

Wrong belt to small but pitch looks fine,i think the belt i need is

c6-944 1.5x124x15

[Richard GibsonParticipant @richardgibson42431]

A really useful thread but are still yet to find an appropriate belt for the Chester DB8 (not the DB8VS), pretty sure the belt would be a M1.5 x Z118 x15 ( though the pulley would take a 19mm width belt. we have spoken to Chester, we bought a M1.5 xz124 x15 from ArcEuroTrade, too long but right pitch and have spoken to them.

Has anyone found one of these belts or found another that fits? Or has anyone modified their DB8 to take a different belt?

Any thoughts, much appreciated. Richard

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