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Chester DB8

Tooth belt

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JasonB07/01/2021 17:35:02
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How to post pics here

Les Jones 107/01/2021 17:35:19
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Many thanks Jason for explaining that. (I never even thought of dividing the measured pitch (In mm) by Pi.) The thread that Michael linked to suggests that the DB8 belt has 124 teeth. As Brian has given the diameter of the pulleys if he tells us the number of teeth on one of them we should be able to tell if the 1.5 pitch belt is the correct one.
One other point is that the Sieg C4a and C6 both use the same timing belt. This makes me think that the DB8 is based on a Sieg C4A and the DB-10G is based on the Sieg C6.

Les.

John Rudd07/01/2021 18:37:16
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https://www.arceurotrade.co.uk/Catalogue/Machine-Spares/C4A-Bench-Lathe-Spares/C4A-210-Timing-Belt-1512415

https://www.arceurotrade.co.uk/Catalogue/Machine-Spares/C6-Bench-Lathe-Spares/C6-944-Timing-Belt-For-6-Speed-C6

Edited By John Rudd on 07/01/2021 18:38:26

Edited By JasonB on 07/01/2021 18:50:54

JasonB07/01/2021 18:48:43
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Doing the maths with the pulley sizes given it looks like it is likely to be 1.5x116 or 2x87 as I said earlier as total length based on those is 546.72mm but may be a tooth either way as don't know if that's measured over the teeth, PCD or root. neither of which tie sin with the ARC belts which are 1.5x124.

If it is the smaller 1.5 pitch the ARC belts may do if there is room to move the motor back on it's mounts.

Edited By JasonB on 07/01/2021 18:50:03

Les Jones 107/01/2021 19:46:02
2292 forum posts
159 photos

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 Gilligan07/01/2021 20:01:10
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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.

JasonB07/01/2021 20:15:13
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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 107/01/2021 20:25:23
2292 forum posts
159 photos

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

JasonB07/01/2021 20:31:37
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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 Gilligan07/01/2021 20:34:52
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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.

JasonB07/01/2021 20:40:25
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So that could make it more like 88/19T if we stick with the 1.5X

Brian Bassett09/01/2021 14:35:40
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Large gear is 90 teeth small gear 19 teeth

Les Jones 109/01/2021 15:36:43
2292 forum posts
159 photos

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 Bassett09/01/2021 17:48:42
12 forum posts
7 photos

whatsapp image 2021-01-09 at 14.37.23.jpeg

Brian Bassett09/01/2021 17:49:31
12 forum posts
7 photos

whatsapp image 2020-05-22 at 11.46.19 (2).jpeg

Brian Bassett09/01/2021 17:59:49
12 forum posts
7 photos

whatsapp image 2021-01-09 at 14.37.34.jpeg

Brian Bassett09/01/2021 18:00:15
12 forum posts
7 photos

whatsapp image 2021-01-09 at 17.56.01.jpeg

Michael Gilligan09/01/2021 18:21:50
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Posted by Brian Bassett on 09/01/2021 18:00:15:

whatsapp image 2021-01-09 at 17.56.01.jpeg

.

.

**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 Bassett09/01/2021 18:33:18
12 forum posts
7 photos

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

c6-944 1.5x124x15

Richard Gibson02/09/2022 11:30:59
2 forum posts

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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