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Clarkson Mark 1 Tool and Cutter Grinder - Data and Tooling

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Index :


1. My Mark 1 Tooling
2. Other Mark 1 and Mark 2 Tooling

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↓ MY MARK 1 TOOLING


I was lucky enough to buy the Clarkson in a University sale.
It is in excellent condition, with paperwork, and some bits of tooling.

The original booklet showed the price they paid as 150 pounds, or '300 pounds with bits'.
I think this is a 1965 machine, serial number 9866.
There is something wrong with the 3 phase motor windings, so I have installed a new single phase motor.
I'm short of space, so I have stored the large pedestal and have bench mounted the business end.

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↓ As soon as I got it home I made a box for most of the bits.

 

 

 

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↓ Here is virtually everything. Now I'm just showing off.

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↓ [91127] Universal Head and bracket.
The bore in the Head is 1.5" ID to accept the holders and mandrels.

Click here to view drawings of the Universal Head and Bracket

 

 

 

 

 

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↓ Holders.
These holders fit directly in the Universal Head.
[?] 1-1/2" OD, 5/8" ID all the way through
[92606] 1-1/2" OD, 1" ID all the way all through
[92628] 1-1/2" OD, 1-1/4" ID all the way through

 

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↓ Holders.
These holders fit directly in the Universal Head.
1-1/2" OD, 5C taper (Uni made)
1-1/2" OD, 1-1/4" ID stopped

 

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↓ Locking collars to fit the holders.
These collars secure the holders in the Universal Head and allow the holders to freely rotate in the Head.
5/8" ID
1-1/4" ID
1-1/2" ID

 

 

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↓ Parallel Tool Holders.
These solid tool holders are used with the 5/8" and 1-1/4" ID holders, which in turn fit in the Universal Head.
The grub screws secure the work in the short bores.
5/8" OD, 1/4" ID for depth of 2-1/2"
1-1/4" OD, 1/2" ID for depth of 2-1/2"
1-1/4" OD, 3/4" ID for depth of 2-1/2"
1-1/4" OD, 1" ID for depth of 2-1/2"

 

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↓ Taper Tool Holders.
These taper tool holders fit directly in the Universal Head.
These are not the genuine Clarkson morse sockets.
I took a chance and bought these blind off ebay. There is a bit of battering on them, but they fit the Head perfectly.
[similar to 92603] 1-1/2" OD, MT1 taper
[similar to 92604] 1-1/2" OD, MT2 taper
[similar to 92605] 1-1/2" OD, MT3 taper
[similar to 93548] 1-1/2" OD, MT4 taper

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↓ Adapter bushes
The adapters fit in the 1" ID holder, and enable that holder to hold smaller work.
[92607] 1" OD 3/4" ID missing
[92608] 1" OD 5/8" ID missing
[92609] 1" OD 1/2" ID missing
[92610] 1" OD 3/8" ID
[92611] 1" OD 1/4" ID

 

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↓ [91103] Toothrest bracket - for spiral work.
This piece has gone rusty again.

 

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↓ [91102] Toothrest bracket - for general work.

 

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↓ Toothrests.
The toothrest holder on the right fits in the swan-necked bracket.

 

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↓ [91104] Two Centre Brackets and Centres.
5/8" ID, 3-3/16" centre height

 

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↓ [91120] Adapter and bush for side and face cutters.
This adapter will hold 1" cutters.
The 1/2" Whitworth securing bolt, 1-1/4" bush and washer are missing

 

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↓ Dedlock grinding mandrels.
I am not too sure I have the numbers right for these. This is my best guess.
[47073] Mandrel for 200 cutters (the one with the cross drilled hole in the shaft).
[32110] Mandrel for 150 cutters.
1" parallel shank

 

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↓ Grinding wheels and flanges.
[93575] Support washers 2 off
[92612] 1 plain grinding wheel
[92613] 1 cup grinding wheel

 

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↓ Extractor hood.

A note from the March Engineering Operators Manual:
"If you use Dry Grinding Machines for 12 hours per week or more you must supply some means of dust extraction.
You may either link your March Tool & Cutter Grinding Machine to your existing system or use a separate March Dust Extraction Unit which can be purchased as an optional extra. If, however, you do not require dust extraction facilities you must blank off the guard outlet with 1/8" minimum thickness of plate."
The law requires you to guard as much of the wheel as practically possible.

 

 

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↓ Misc home and Uni made.

 

 

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↓ OTHER MARK 1 AND MARK 2 TOOLING


↓ 15-02-11 This Bracket for the Universal Head sold on ebay for 14 pounds.
The round degree dial that fits in the slot is missing.

 

↓ 19-12-10 These finger brackets sold for 33 pounds on ebay.

 

↓ 19-12-10 This center bracket sold for 32 pounds on ebay.

 

↓ 19-12-10 This Universal Head sold for 62 pounds on ebay.

 

↓ This brand new Universal Head was up for sale from Jubilee machine Tools.
Going by the paint colour I think this is made by March Engineering and is maybe a Mark 2 item (although it could very well have been supplied with their Mark 1 machines).
I guess the serrated collar can be used to index the workhead.

 

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This set of accessories was for sale for 185 pounds.
The set contains ...
... assortment of sleeves for the workhead, and adapter bushes.
... regrind mandrel for deadlock 200 cutters.
... regrind mandrel (miniature) for deadlock cutters.
... spanner, allen keys, missing spanners.

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↓ Here are some Spindle Extension dimensions to make an exact copy of the original (to be completed).

UPDATE .. the dimensions in the plans and drawings section maybe more reliable than those here.
I will revise this section once I know the correct dimensions (which should be soon).

The body is 1.5 inch/38mm diameter.
The body is 3.75inch/95mm long.
Many thanks to Mr Panayi for providing the above dimensions.

I have read elsewhere that the body is 2.5inch/63.5mm long.
Maybe the above 95mm dimension is really 2.5inch\63mm for the body plus 32mm for the spindle, making an overall length of 3.75inch\95mm) ?
I would say the diameter of the Spindle Extension is definitely 38mm, to match the diameter of the machine spindle flange.

The spindle portion is the same as the machine spindle i.e. is 32mm long overall, has a 22mm long 1/2inch BSF threaded portion, and a 10mm plain portion.
I will confirm these dimensions once I see an original Spindle Extension (anyone?)

It looks easy enough to make a Spindle Extension that will work and it does not need to be exactly like the original.

Here are the dimensions needed in order make an exact copy of the original Spindle Extension:

1. Diameter of the body (1.5 inch/38mm)
2. Length of the body (3.75inch/95mm or 2.5inch/63.5mm)
3. Width across the spanner flats (?)
4. Width of the spanner slot (?)
5. Distance of spanner slot edge from the end of body that has the internal thread (?)
6. The internal and external threads are 1/2inch BSF Left Hand

If you have an original part I would be more that interested to know the correct dimensions (Steve microstoc@hotmail.com).

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↓ I have not got the Spindle Extension.
This is Pani Panayi's homemade Spindle Extension.
This Spindle Extension was up for sale at http://www.homeworkshop.org.uk
The internal and external threads are 1/2 inch BSF Left Hand.
The body is 60mm long.
The spindle is 43mm long.

 

 

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↓ This is a photo of two Spindle Extensions (not mine).
I don't know if these are genuine Clarkson or not.
The internal and external threads are 1/2 inch BSF Left Hand.
Spindle 1 - the body is 70mm long, the spindle is 43mm long.
Spindle 2 - the body is 50mm long, the spindle is 34mm long.

 

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