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Clarkson Mark 1/2/3 Attachments

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Here are the attachments for the Mark 1, Mark 2, and Mark 3 machines.

Index :


1. Air Bearing Flute Grinding Attachment
2. Drill Point and Tap Lead Grinding Attachment
3. Radius Grinding Attachment
4. Controlled Spiral Grinding Attachment

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AIR BEARING FLUTE GRINDING ATTACHMENT (ABFGA).

The ABFGA pictures and information has been kindly supplied by Patrick Carlier.
The attachment has been stored unused for quite a number of years. Pat has taken it apart and is in the process of restoring it for a friend.

↓ This is the paperwork that came with the attachment.
It was ordered from March Engineering on 20th February 1991 and sent over to Belgium.

 

↓ Here is the body of the ABFGA. It is attached to a non-standard 20mm plate, in order to raise it up on the machine it was used on.
The airbearing itself is mainly a piece of cast aluminium with a precision ground steel bush pressed in, with some holes to allow the air to pass.

 

↓ The attachment is rusty due to the storage conditions.
You can see a couple of the air holes in this picture.

 

↓ Here is a view of the underside of the body, showing the locating lugs.
The threaded boss for the air inlet is at the top.

 

↓ Here is the inner bush.
The bush has been pressed out. The insides were full of rust and debris, which was a shame.
The bush was a light press fit in the holder block, with an Oring at each end to seal the air.

 

↓ You can just make out the groove for the Oring.

 

↓ Here is the original March Engineering steel box.
There is a "March Engineering" sticker on the box, but it is now faint and hardly visible.

 

↓ There are 3 long sleeves and each is capable of holding a different OD size of collet.
The large and small sleeve (top and bottom in this picture) are standard equipment.
The medium sleeve (middle in this picture) is described as optional equipment.
The length of the large sleeve is close to 40cm to give you an idea.
There are 3 Locking Rings. One Locking Ring is the original standard equipment and the other two are of an alternative design.

 

↓ Here is a close up of the ends that hold the collets.

 

↓ Here is the full set of collets.
The 25,32,38 collets fit the standard equipment large sleeve.
The 20 collet fits the optional equipment medium sleeve.
The 6,10,12,16 collets fit the standard equipment small sleeve.
This set is metric, and it is believed that each sleeve accepts both imperial and metric collets.

 

↓ Here is a close up of one of the collets.

 

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↓ This ABFGA was up for sale by Jubilee Machine Tools for 450 pounds plus vat.
This is Clarkson made and comes in a fitted wooden box. The wooden holders inside the wooden Clarkson box look to be the same as the March wooden holders in the March metal box.

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DRILL POINT AND TAP LEAD GRINDING ATTACHMENT (DPATLGA).

The DPATLGA pictures and information has been kindly supplied by Patrick Carlier.

 

 

 

 

 

 

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↓ 09-02-11 This DPATLGA sold on ebay for 383 pounds.
The attachment came with a 6 jaw chuck and only the 3 pinned collar.

 

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RADIUS GRINDING ATTACHMENT (RGA).

The RGA Serial Numbers are preceeded by RT (Rotary Table?).

↓ 07-11-10 This RGA sold on ebay for 160 pounds.

 

↓ 19-12-10 These RGA bits sold on ebay for 22 pounds.

 

↓ 14-12-10 This RGA sold on ebay for 139 pounds.
Serial Number = 2064

 

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↓ 21-12-10 This RGA sold on ebay for 124 pounds.
Serial Number = 614

 

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↓ This RGA belongs to Bernard Wright.
Serial Number = 495
When Bernard got the RGA a few of the parts were missing. He has been able to fabricate the missing parts to bring the RGA into use.
I believe he has some detailed CAD drawings that will enable you to build the RGA from scratch.

 

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↓ Another RGA example.
Serial Number = 393

 

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↓ This RGA was included in a sale with a Mark 1 machine.

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CONTROLLED SPIRAL GRINDING ATTACHMENT (CSGA).

↓ This CSGA was up for sale by Jubilee Machine Tools for 450 pounds plus vat.
Serial Number = 98200
Type = C.S.37
This one is for the Mark 3 machine.

 

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