Clarkson Mark I/II/III Tool and Cutter Grinder - Home Made parts and Modifications






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By Bernard C Wright :


1. Antibacklash - CrossFeed Nut modification
2. New Paint Job
3. Diamond Dresser Post
4. Tooth Rests for the Radius Attachment
5. Overarm Tooth Rest
6. Micrometer Dial
7. Slide Stops
8. Miscellaneous



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↓ CROSS FEED NUT ANTI-BACKLASH MODIFICATION

Modification by Bernard Wright.
The Clarkson cross feed nut is split to facilitate anti-backlash take-up.

↓ A hole is drilled, and a slit is neatly made in the cross feed nut.
The nut is drilled and tapped to accept 2 socket screws.
The socket screws can be adjusted to tighten/loosen the nut on the leadscrew, thus adjusting the backlash.
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↓ Here is the nut in action.
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↓ PAINT JOB

Paint job by Bernard Wright
↓ The Clarkson looks a million dollars with this paint job.
The paint is Coo-Var Hammercote Hammered Light Green and brushes on quite well, but needs 2 coats for total coverage, due to the hammering leaving bare spots.
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↓ DIAMOND DRESSER POST

Bernard Wright
The actual diamond on the home made Dresser Post was purchased years ago, maybe marketed by Wolf for 6 pounds.
It's a 1/2 carat brazed onto a 3/8" UNF threaded and knurled bolt.
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↓ Here is a close up of the diamond tip.
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↓ TOOTH RESTS FOR THE RADIUS ATTACHMENT

Bernard Wright
↓ The two tooth rests on the left fit the Radius Attachment.
The Diamond Dresser post is on the right.
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↓ The toothrests were made from solid 50mm dia cast iron billets. The billets were sourced locally from a firm called Locate at Scunthorpe, who are willing to sell 12" lengths without any fuss.
These items were machined in the dividing head, allowing all sides to be accurately machined without removal of the item, apart from radiusing the ends.
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↓ OVER ARM TOOTH REST

Bernard Wright
↓ The overarm tooth rest being machined on the rotary table.
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↓ Here is the overarm tooth rest in action.
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↓ MICROMETER DIAL ON THE CROSS FEED SCREW

Bernard Wright
↓The Micrometer Dial assembly was made from a 75mm dia cast iron billet.
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↓ SLIDE STOPS

Bernard Wright

The anti-backlash nut, the Micrometer Dial and the Bed Stops all provide better accuracy and repeatability.
The accuracy of any grinding job has now been vastly improved as things are under tight control.

You can see the Bed Stops on either end of the table.
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↓ This is an underside view that shows the manufacture and operation of the Bed Stop quite well.

Each Bed Stop consists of a bracket that is secured to the table by two socket head screws.
Each Bed Stop has an 'L' arm. The 'L' arm is made from a 1 inch square. The 1 inch square is machined down to 3/4 inch on one side, to give 1 inch x 3/4 inch. This is then machine down to 1/2 inch to give the 'L' shape.
The 'L' arm is secured to the bracket by a concealed screw. A 3/4 inch groove is milled in the bracket and the groove locates the 'L' arm on the bracket. Nice.
The 'L' arm is drilled and tapped M10 for a 4 1/2 inch long adjusting screw.
There is a knurled locking nuts inboard of the 'L' brackets, to lock the 4 1/2 inch adjusting screw. This brings 'repeatability' to any required stop distance.

Note the 'L' arm locating groove, the knurled locking nut, and the 4 1/2 adjusting screw.
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↓ MISC

Bernard Wright
↓ Here is a batch of essential home made bolts and washered nuts. Nice.
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