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L. H. Sparey Running Centre

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James Jenkins 121/06/2018 19:25:22
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95 forum posts

Hi all,

I am looking at the running centre in L. H. Sparey's book The Amateur's Lathe (pg. 57 in my copy) and contemplating whether this would make a good first middling project. It seems fairly straight forward and would be a very helpful addition to my set up. Couple of questions that maybe you can help with:

1. What do you think of the design?

2. It seems unlikely that the specified Hoffman T.E XBY & S.K.F R7 bearings are going to be available, any suggestions on replacements?

3. Cast steel seems a bit tricky to get hold of too, would silver steel be an acceptable alternative?

Many thanks for your time and look forward to hearing your thoughts.

James

Jens Eirik Skogstad21/06/2018 19:52:57
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348 forum posts
22 photos

I has made the L.C Sparey running centre from The amateur's lathe. The design is good and i am very satisfied to use the running centre in many year now.

The house is made of mild steel (no important to be cast iron, hard or high alloy) and the running cone is made of silver steel.

The bearing must be selected to nearest in all dimensions ,also change the dimension in the house and the running cone to fit the bearings.

Light press fit the bearing in the house and hand push fit the running cone into the bearing. Never light press fit the running cone into the bearing due the bearing will stuck!

Fill up grease into the house before the running cone is mounted.

James Jenkins 121/06/2018 21:38:36
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95 forum posts

Hi Jens,

Thank you that's really helpful. What bearings did you use?

Kind regards,

James

Jens Eirik Skogstad22/06/2018 00:18:52
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348 forum posts
22 photos

The bearing size..

Single row angular contact bearing 12x32x10 SKF 7201BEP

Deep groove ball bearing 10x26x8 SKF 6000

smiley

James Jenkins 122/06/2018 07:54:22
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95 forum posts

Thank you!

bricky22/06/2018 08:11:22
291 forum posts
30 photos

Hi James, I made two rotating centres from his plans 40years ago and they are still going well today.Why two,at the time I was making clocks and I needed a fast speed for my flycutters which I mounted in a bar between the centres with a pulley on it and driven from a motor mounted behind this got me to over 3000 rev's and the centres stood this easily.

Frank

Robbo22/06/2018 09:44:49
1438 forum posts
126 photos

James

Like most of the designs in 'The Amateur's Lathe', Sparey first published this in 'The Model Mechanic' magazine, of which he was Editor. This one was in July 1948.

In the text he said that "As the centre revolves, it may be made of mild steel, but a steel of harder grade is preferable as this will withstand accidental damage much better. A cast steel or silver steel may be used- although the centre is not hardened...……."

For those with an interest in such things I have put a copy of the 2-page article in my albums as "Sparey Running Centre"

Michael Gilligan22/06/2018 10:06:39
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11244 forum posts
477 photos
Posted by Robbo on 22/06/2018 09:44:49:

... For those with an interest in such things I have put a copy of the 2-page article in my albums as "Sparey Running Centre"

.

And I have grabbed a copy for reference, Thank You

... an excellent, concise description of the work.

MichaelG.

Ian S C22/06/2018 11:01:21
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6865 forum posts
224 photos

When I first got my lathe, I made a number ( probably a dozen) of running centres of a similar design (I didn't know of Sparey's book), I used what bearings I had, and made the centre from a bit of old car axle. I sold them as suitable for a wood lathe, and made them with #1, and #2 MT. $NZ 25 each twenty five years ago, not too bad for a practice exercise.

Ian S C

Bob Stevenson22/06/2018 11:16:47
233 forum posts
3 photos

Sparey is still good for everything but a bit dated now. If you are going to make a live centre take a look at Steve Jordan's video here as his is a more modern take that gives greater facilities, especially on small lathes...

https://www.youtube.com/watch?v=L0ZTw5J8oTE

Michael Gilligan22/06/2018 11:20:34
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11244 forum posts
477 photos

That's neat, Bob yes

MichaelG.

Alan Jackson22/06/2018 11:23:16
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136 forum posts
54 photos

Hi James,

If you look at my photos you will see a simple design I made years ago and its still working very well.p1040869.jpg

Alan

John MC22/06/2018 11:34:39
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82 forum posts
6 photos

Reading this thread makes me feel old! Made a Sparey running centre 40+ years ago when the imperial size bearings were cheap and readily available. I asked if I could make it at work during my apprenticeship, it was considered to be a good grinding exercise, so everything hardened and ground. Made it with a 2 Morse taper to suit the lathe I had at that time, sold with that lathe after about 15 years use, still going strong now.

John

duncan webster22/06/2018 11:45:07
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1540 forum posts
18 photos

I lost the will to live part way through the You Tube, but the cross between an inside caliper and a DTI looked a useful bit of kit, anyone know it's proper name?

Of the 2 the Sparey design looks the better, the rotating part should be a tight fit in the bearings, the outers can be slip fit. Rather than the press fitted seal you can get shielded bearings

Bill Davies 222/06/2018 12:27:23
54 forum posts
10 photos

The bore gauge looks nice, Duncan. Here is a Mitutoyo version:

**LINK**

Just don't look at the price!

Bill

duncan webster22/06/2018 12:35:06
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1540 forum posts
18 photos

I'm glad I was sitting down! However, knowing the name I searched on e-bay and found an ad for MEW99 which has an article on how to make one. Another job for the to-do list!

Edited By duncan webster on 22/06/2018 12:35:34

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