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Chester DB8

Tooth belt

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Brian Bassett05/01/2021 17:35:03
12 forum posts
7 photos

I have a Chester DB8 lathe and the tooth belt has shredded ,so cant get any numbers from it, would anyone have the details of the belt i need, have tried Chester direct but with no luck .

Many thanks for any help

Brian

John Rudd05/01/2021 20:48:30
1433 forum posts
9 photos

If you can measure the belt width and length.....? Any idea of the tooth count?

The 9 x 20 lathe has a 170xLO50 belt that looks similar has 85 teeth and is available from:

https://www.bearingstation.co.uk/products/xl-section-02-pitch-timing-belt-05-wide-17-long=43213

I checked an online manual for the db8 ( Chesters website) but it doesnt give the size in the parts listing...

so over to a user on here perhaps...?

DC31k05/01/2021 20:51:59
452 forum posts
1 photos

https://www.model-engineer.co.uk/forums/postings.asp?th=45976

Can I make a suggestion? The resources available when you type your query into Google outnumber those here on this little site, good though it is, by several orders of magnitude.

Brian Bassett06/01/2021 14:02:46
12 forum posts
7 photos

I did a google search and it brought me to this site smiley

Les Jones 106/01/2021 14:17:30
2225 forum posts
153 photos

As John says if you measure the belt length, width and count the number of teeth there will be a much better chance of identifying the belt. I have a Chester DB-10G and it is just possible that it uses the same belt.

Les.

Brian Bassett06/01/2021 14:25:14
12 forum posts
7 photos

I don't have a belt is a lot of the problem working out ,it just shredded.

John Rudd06/01/2021 14:46:15
1433 forum posts
9 photos

Brian, I sent you a private message....see top of page for flashing envelope...

Les Jones 106/01/2021 15:09:29
2225 forum posts
153 photos

You can thread some string or tape round the two pulleys to get a rough idea of the length and measure the width of the pulleys to get a rough idea of the belt width. you may even have a piece of the belt that was still intact enough to measure the tooth pitch.

Les.

not done it yet06/01/2021 17:33:37
5853 forum posts
20 photos

You have pulleys so you can count teeth and measure the diameter and width. You should be able to measure the centre distances between those pulleys. All else you need to know is how the belts are described - inside or outside dimension.

Bob Stevenson06/01/2021 17:49:50
498 forum posts
7 photos

If Chester can’t supply this info then they don’t deserve to do any business!

Look at the corresponding Waco.......WM210 probably? And see whAt that uses.

Adam Mara06/01/2021 18:43:37
145 forum posts
10 photos

A Google search bought up store.lathes.co.uk, Worth a look?

Tomek06/01/2021 20:49:11
37 forum posts
23 photos

Hi Brian. I have db8vs, I'm guessing they will have same belts?

Michael Gilligan06/01/2021 20:55:23
avatar
17833 forum posts
825 photos
Posted by Bob Stevenson on 06/01/2021 17:49:50:

.

If Chester can’t supply this info then they don’t deserve to do any business!

.

I wonder: Is that can’t or won’t ?

... either way, I agree

MichaelG.

.

Edit: __ it may be worth reading this previous thread:

https://www.model-engineer.co.uk/forums/postings.asp?th=45976

Edited By Michael Gilligan on 06/01/2021 20:58:04

Les Jones 106/01/2021 22:24:50
2225 forum posts
153 photos

Hi Michael,
Your link has given the required dimensions of the belt which is a good start as Brian does not seem prepared to to take any measurements. This seems to be the same belt as on my Chester DB-10G (Chester were no help when I needed to replace this belt.) When I measured the tooth pitch of my old belt I thought it was 3/16" (= 4.76mm) But I found it was called 5mm pitch which is probably what it is under tension. RS stock one that has the correct pitch (5mm) and number of teeth (124) but it is 16mm wide as opposed to the correct belt which is 15mm wide .Brian would have to measure the distance between the flanges on the motor pulley to see if this would fit.

Les.

Edited By Les Jones 1 on 06/01/2021 22:25:42

Brian Bassett07/01/2021 12:40:16
12 forum posts
7 photos

I think the length of belt is 546mm from timing belt calculator from Bearing boys web site, diam of large pulley is 130mm small pulley 27.8 w is 18 mm, i have a belt that is to short but the teeth mesh fine only details on the belt are 1.5x83 no idea what it means ?

Brian Bassett07/01/2021 12:52:57
12 forum posts
7 photos

The distance between pully centres is 140mm

Les Jones 107/01/2021 15:02:59
2225 forum posts
153 photos

The belt for the DB-10G is called a 1.5 * 124 * 15. I think this is the same belt that is used on a DB8 lathe. I think the 1.5 part is related to the pitch but it does not seem to have any simple relationship with either metric or imperial units.

For comparison with the DB-10G the the small pulley (On the motor) has 19 teeth and the OD is 28.1mm. The large pulley has 90 teeth and the OD is 134.25 mm The distance between the pulley centres is 154mm.

Les.

Martin W07/01/2021 16:09:55
869 forum posts
29 photos

If the DB8VS has the same arrangement as the DB7VS then the pulleys are plain V section and don't have teeth. The only reason for using a toothed V belt would appear to be to give it the extra flexibility to accommodate the motor drive pulley diameter. If so then the number of teeth per unit length is irrelevant.

Martin

JasonB07/01/2021 16:36:11
avatar
Moderator
20443 forum posts
2267 photos
1 articles

Here we go. A bit of digging and the relationship to pitch and the numbering system becomes clearer. The 1.5 and 2 that prefix this type of belt are a multiplier of Pi. So in the case of 1.5 belts the pitch is actually 1.5 x 3.142 or 4.713mm, belts prefixed with a 2 like the one on my X3 are 2 x 3.142 or 6.284mm pitch.

If brian is able to give an idea of pitch then it should not be too hard to work out if he needs something like a 1.5x116 or 2x 87

Page 16 of this pdf catalogue is what enlightened me to the meaning of pitch. A search for "Module" belts may be worth trying.

Edited By JasonB on 07/01/2021 16:37:27

Brian Bassett07/01/2021 17:33:40
12 forum posts
7 photos

I have some pictures but cant see how to post them ,not much help am i

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