Chester DB8

[Brian BassettParticipant @brianbassett83323]

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

[Brian BassettParticipant @brianbassett83323]

Tooth belt

[John RuddParticipant @johnrudd16576]

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…?

[DC31kParticipant @dc31k]

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 BassettParticipant @brianbassett83323]

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

[Les Jones 1Participant @lesjones1]

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 BassettParticipant @brianbassett83323]

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

[John RuddParticipant @johnrudd16576]

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

[Les Jones 1Participant @lesjones1]

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 yetParticipant @notdoneityet]

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 StevensonParticipant @bobstevenson13909]

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 MaraParticipant @adammara]

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

[TomekParticipant @tomek]

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

[Michael GilliganParticipant @michaelgilligan61133]

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 1Participant @lesjones1]

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 BassettParticipant @brianbassett83323]

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 1.5×83 no idea what it means ?

[Brian BassettParticipant @brianbassett83323]

The distance between pully centres is 140mm

[Les Jones 1Participant @lesjones1]

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 WParticipant @martinw]

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

[JasonBModerator @jasonb]

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 1.5×116 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 BassettParticipant @brianbassett83323]

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

[JasonBModerator @jasonb]

How to post pics here

[Les Jones 1Participant @lesjones1]

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 RuddParticipant @johnrudd16576]

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

[JasonBModerator @jasonb]

Doing the maths with the pulley sizes given it looks like it is likely to be 1.5×116 or 2×87 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 1.5×124.

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

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