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Dore Westbury Mk2 drive pulley repair

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Canobi24/05/2017 00:12:44
23 forum posts
Posted by Ian Skeldon 2 on 23/05/2017 22:10:35:

Canyon can you let me have your contact details please, I have a Grayson and may want to ask some questions about it.

Thank you,

Ian

PM sent

Canobi05/06/2017 11:34:22
23 forum posts
Quick update and a thank you to Mike again.

Ashley Power were very helpful and I have two sets of correctly sized bushings on their way to me for a very reasonable price

I also picked up a set of circlip pliers and will get stuck into tearing the pulley down when the bushings arrive.


I have a question to all DW owners, I removed the Jakobs chuck that came with the mill and found the morse shank had been shortened and retapped.

Measurement of bore depth came to 2.1/4" and regular length shank are too long,Is this normal, or something specific to my mill?

The way I see it I have two choices, take the quill out and re-bore it, or modify any MT2 arbours I want to use in the mill.

Not as keen on attempting the former myself using such an old lathe but the latter would be in the realms of doable.

Philip Rowe05/06/2017 12:39:02
68 forum posts
2 photos

Canobi,

Just checked my DW spindle and I find that any of my morse taper tooling which all measure around 2.5" long fit my spindle without any problems. I do wonder if your spindle nose may have been modified (shortened) at some time in the past. I machined my spindle when I built the machine to the D/W drawings to suit the Myford spindle thread. Mine measures including the shoulder with the spanner flats 1.5".

Phil

Canobi05/06/2017 13:09:12
23 forum posts
Posted by Philip Rowe on 05/06/2017 12:39:02:

Canobi,

Just checked my DW spindle and I find that any of my morse taper tooling which all measure around 2.5" long fit my spindle without any problems. I do wonder if your spindle nose may have been modified (shortened) at some time in the past. I machined my spindle when I built the machine to the D/W drawings to suit the Myford spindle thread. Mine measures including the shoulder with the spanner flats 1.5".

Phil

Thanks for checking Pillip, I was wondering the same thing, the pulley only has a stack of three as opposed to six I've seen on most and the quill thread, while 1.125" x 8tpi is Witworth, not UNF.

Canobi04/07/2017 12:23:39
23 forum posts

Hi folks

Ergh, gathering everything I need is taking ages on such a small budget, but I'm nearly there.

Bushings are in (got two sets just in case), as well as the circlip pliers. Just wating for the oil to arrive, and for me to get an apropriate piece of bar to use on them. Last months budget went on a desperately needed metal band saw, having been donated quite a bit of stock materials, it was starting to become like the saying "water water everywhere, but not a drop to drink" lol.

I made small progress with the lower pulley section, though I didn't need a bar, it was so thin on the one side I was able to prise is out. Judging by how stress resistant it was when bending it, I don't think it was an oilite. Since wear can hide and fill the gaps of an oilite, I snapped a piece off along the thickest area to see if there was any evidence of holes or pockets running through the fracture:

As can be seen, it appears to be solid so I'm guessing the other one will be too.

Regarding oil preload. I've seen people use hands and whatnot to press oil throughout a bushing, but was wondering, would using my vacuum chamber work?

I made one for moulding/casting resins and silicone but it occured to me that it might draw out the air and fill the bushings that way, I could warm them up a bit in the oil to aid the process and leave them to cool in the vacuum.

Canobi17/08/2017 23:02:59
23 forum posts

Finally gathered all the necessities and got my degassing chamber down from the loft, which I'll be using to prime the oilite bushings.

After having at it, I finally got the planetary section disassembled but may have hit a snag.

It might just be me but it kinda looks like the bushing butted up to a shoulder, can anyone confirm that?

If it is, any ideas on how to remove the bushing?

If I turn my press bar down to fit the bore from this side, it won't be wide enough to catch the bushing on it's way through. Annoyingly it fits just right if pushed in from the gear side.

elanman18/08/2017 21:46:30
22 forum posts

Canobi,

From the data of my Mk2 DW the bore on the inner drive sleeve should be bored right through. So the bushes should not be up to a sholder. Is there just a spacer between the bushes?

Your main spindle is standard (I think). However the tang on a standard MT drill chuck does need chopping off as there is no slot for a drift to eject the chuck. MES did recommend making an ejection nut the fit the Myford chuck thread.

Cheers

John

Edited By elanman on 18/08/2017 21:48:32

Edited By elanman on 18/08/2017 21:50:36

Edited By elanman on 18/08/2017 21:51:27

Edited By elanman on 18/08/2017 22:05:39

toneless18/08/2017 22:38:46
avatar
7 forum posts

Check out page #3 from the DW working instructions and sheet 3 from the drawings. Compare the measurements and you may be able to find out what's happening over there.

You can find the MK1 instructions and plans from Tony @lathes.co.uk or download them for free from the Dore Westbury yahoo group. Look at the file section for the MK1 manual and VM drawings.

Canobi19/08/2017 00:37:52
23 forum posts

It transpires I have a Mk1, apparently distinguishable by which side of the machine the quills fine feed is (mine is on the left, Mk2s are on the right).

The inner drive sleeve (thanks for dropping the correct name for it John) and small clusters still need a good clean , which I can do now they're appart, Ill probably get a better idea of what's what then.

Canobi21/08/2017 21:44:44
23 forum posts

I went ahead with the vacuum chamber to prime the oilite bushings, and it worked a treat

Michael Gilligan22/08/2017 07:58:34
10180 forum posts
441 photos
Posted by Canobi on 21/08/2017 21:44:44:

I went ahead with the vacuum chamber to prime the oilite bushings, and it worked a treat

.

Brilliant job, Sir yes

Great to see the process in action !!

MichaelG.

Canobi23/08/2017 21:45:02
23 forum posts
Thanks Micheal
Canobi26/08/2017 22:11:48
23 forum posts

I got the drive sleeve bushing out, but because of the shoulder, I used my lathe to thin the brass enough for me to pull it out with pliers:

Edited By Canobi on 27/08/2017 11:38:33

Canobi13/09/2017 23:56:44
23 forum posts

She's nearly there guys, I can almost smell the cutting oil...

 

The lower pulley section is back on the mill now and runs very smoothly

 

Needed to find a reamer I could use with the limited equipment I have, which held up precedings for a bit. Luckily I managed to score a precision 1" chucking reamer on ebay last week that had only been used once, so I was still nice and sharp and didn't mar the brass.

 

I'm now making a holder for the drive sleeve. Though not seen, it has a 12mm shank which will be held by a 2MT collet in the tailstock.

 

Not much left to do now...

Edited By Canobi on 13/09/2017 23:57:52

Edited By Canobi on 13/09/2017 23:59:21

clogs14/09/2017 07:59:41
309 forum posts
12 photos

hi all,

out of interest, removing oilite bushing in a blind hole or not......

just use a tap to put a thread in it.......then use a bolt to either pull with a slide hammer or tap (hammer) it out......

simples........clogs

Canobi14/09/2017 08:47:42
23 forum posts
I like the idea but I don't have taps and bolts that big which is why I used my lathe
Ian S C14/09/2017 10:13:02
avatar
6457 forum posts
216 photos

To remove a bush from a blind hole: Make a short shaft, a good fit in the bush, fill the bush about half full of grease, put the shaft in the hole and push it down until it contacts the grease, now whack it hard with a big hammer. The bush should pop up. You may need more grease, and another hit or two with the hammer.

Ian S C

Canobi14/09/2017 11:17:03
23 forum posts
Very nifty Ian, thanks for sharing that one :D
mark costello 114/09/2017 15:08:26
avatar
365 forum posts
3 photos

I have heard of oily rag being used also.

Canobi15/09/2017 16:05:44
23 forum posts

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