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Clarkson Mark 1 and Mark 2 Tool and Cutter Grinder - Plans, Drawings, Dimensions, and Colours

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This page contains plans, drawings, and dimensions of the Clarkson accessories and equipment.

All drawings are supplied in good faith and the dimensions and details are believed to be correct.
Most of the dimensions are metric and the imperial equivalent should be obvious.
If you come across any errors then please let me know.
If you have any plans, drawings and dimensions you want to share then I would be more than happy to include them here.

If you would like detailed photos of the parts I have (to clarify the drawings) then send me an email.

Index :


1. Tooth Rest Bracket For General Work
2. Tooth Rest Bracket For Spiral Work
3. Universal Head Bracket
4. Universal Head
5. Mark 1 Extension Spindle
6. Mark 2 Pulley Dimensions
6a. Flat belts on crowned pulley wheels
7. Mark 1 and Mark 2 Spindle Dimensions
8. Google Sketchup Files
9. Paint for the Clarkson
10. Table

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↓ Clarkson Mark 1 - Tooth Rest Bracket For General Work.

This drawing was kindly supplied by Ian Pendlebury.
As Ian has pointed out, and with which I agree, most of the dimensions are not too critical. The dimensions on the original parts would have varied with the quality of each casting.

This tooth rest bracket is the original supplied with the Clarkson Mark 1 machines and is part number 91102.
March appear to have discontinued supplying the 91102 bracket with their Mark 1 machines, and instead supplied the newer smaller 97010 bracket with their Mark 1 and Mark 2 machines. I don't think the 97010 bracket was made when Clarkson were badging the machines (but I may be wrong). March probably looked at the 91102 bracket and saw that they could save on material and so made the smaller 97010 part.

 

 

Ade Gwilliam has made use of this drawing to make a Tooth Rest Bracket for his Clarkson Click here for the You Tube videos

 

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↓ Clarkson Mark 1 - Tooth Rest Bracket For Spiral Work.

This drawing was kindly supplied by Ian Pendlebury.

This tooth rest bracket for spiral work is the original supplied with the Clarkson Mark 1 machines and is part number 91103.
March supplied the same 91103 for their Mark 1 machines, and also supplied a "tooth rest for spiral work" with a rectangular base for their Mark 2 machines, listed as part number 97106.

 

 

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↓ Here is my drawing of the Universal Head Bracket.
The metric dimensions are approximate and should easily translate to inches.
This is just a rough sketch. I have not included the degree dial.
Notes: the right hand side is perpendicular to the base, and the left hand vertical side is angled. The centre of the hole for the bolt that secures the Head is 105mm from the table top.

 

 

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↓ Here is my drawing of the Universal Head.

This Universal Head and Bracket is the original supplied with the Clarkson Mark 1 machines and is part number 91127.

 

 

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↓ Here are my drawings of the Mark 1 Extension Spindle.

This Clarkson Extension Spindle is the original supplied with the Clarkson Mark 1 machines and is part number 92614.

The March Extension Spindle for the March Mark 2 machines does not have the spanner flats. The flats are replaced by a single hole to accept a C spanner.
The March Extension Spindle part number is M81700.
The Mark 2 extension spindle will be a different size to the Mark 1 extension spindle because the Mark 2 spindle is longer than the Mark 1 spindle. (See the Mark 2 page)

Alas, no one seems willing to provide the extension spindle dimensions.
I have studied various pictures and photographs and come up with the following estimated dimensions.
If you can provide all the correct dimensions then it would be great to hear from you.

 

 

 

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↓ I used Google SketchUp for some of my drawings.
You can get a free copy of SketchUp from Google. Use Sketchup to rotate and view the drawings. It's cool.
You can download my files here (right click, then choose save).
clarksonheadbracket.skb
clarksonhead-1.skb
clarksonhead-2.skb
clarksonhead-3.skb
clarksonspindleextension-1.skb
clarksonspindleextension-2.skb

 

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↓ Here are some dimensions of the drive pulleys on the Clarkson Mark 2.
Many thanks to Patrick Carlier from Belgium for supplying the pictures and dimensions.

Both pulleys on the Mark 1 are single pulleys, to give 4000rpm.
Both pulleys on the Mark 2 are double pulleys, to give 4000rpm and 6000rpm.

Both pulley sections on the Mark 2 are 28.4mm wide.

The diameters of the Mark 2 pulleys at the crowns are:
High speed, spindle side = 38.00mm
High speed, motor side = 79.90mm
Low speed, spindle side = 49.40mm
Low speed, motor side = 69.10mm

The diameter of the spindle at the grinding wheel end is 0.5inch, with a 1/2 inch BSF left hand thread.
The diameter of the spindle at the pulley end is 5/8 inch, with a 1/2 BSF left hand thread.
The pulley itself is secured just like the wheel , with a 1/2 BSF left hand threaded nut. There are no keyways or setscrews.

 

↓ Here is the double pulley on the Mark 2 spindle secured by the 1/2 inch BSF left hand nut.

 

↓ Here is the double pulley removed from the Mark 2 spindle shaft (thanks Pat).
The diameter of the spindle at the pulley end is 5/8 inch, with a 1/2 BSF left hand thread.

 

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↓ Matthius Wandel provides an explanation as to why flat belts remain centered on crowned pulleys.

Flat belts on crowned pulley wheels

 

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↓ Mark 2 (20-02-11) Here are a couple of pictures showing the difference in the Mark 1 and Mark 2 spindles at the wheel end.
Many thanks to Ken Widdall for supplying the pictures and dimensions.

As Ken has pointed out, if you are making an extension spindle your sizes will be different, depending on the machine.

↓ This is the end of the Mark 1 spindle. It is 1.1/4 inch (31.75mm) long at the wheel end.

 

↓ This is the end of the Mark 2 spindle. It is 1.3/4 inch (44.45mm) long at the wheel end.

 

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CLARKSON PAINT

The stationaryengineparts.com website are advertising paint for the Clarkson.
They have Machinery Paint Colours for Clarkson, Myford, Harrisons, Tom Senior etc.
They have a 'Clarkson Tool and Cutter Grinder Grey', paint number #767D8D, for about 31 pounds a litre (including shipping and vat). They say it is the correct shade for Clarkson tool & cutter grinders painted in the distinctive light blue/grey, a lovely colour with a slight hint of blue.
I have not tried this paint. I might just buy a can someday, to see if it matches my machine. I don't really need it, but it would be nice to have.

click here to see the Clarkson colour page on their website

click here to go to their website homepage

Paragon also advertise a paint colour for the Clarkson ... click here to go to their website homepage

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CLARKSON SWIVELLING TABLE

Here is a rough sketch showing the approximate dimensions of the table that swivels.

 

 

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