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






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By Matthew Tinker :

1. Drill Point Grinding Set Up
2. MT3 Tool Holder
3. Universal Vice
4. Centre Brackets



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↓ DRILL POINT GRINDING SET UP

This is Matthew Tinkers' homemade drill point grinding set up.

click here to see the source

↓ Here are the parts before assembly.
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↓ The Universal Head bracket is scratch built and is 20mm lower than the factory part. Here's how it was assembled and welded.
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↓ The Universal Head bracket is graduated.
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↓ Sharpening a 50mm drill bit.
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↓ Sharpening a 5/8th drill bit. The finger was awkward to use on the smaller size drill bits.
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↓ The rear stop mechanism.
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↓ MT3 TOOL HOLDER

This is Matthew Tinkers' homemade MT3 Tool Holder.
The MT3 tool holder is fixed to his homemade Universal Head Bracket (see above).
This is a really neat job, and it just goes to show you can still get by if your grinder came without the tooling.

click here to see the source and his write up.

↓ This photo shows a ZA12 (zinc alloy) block on the left. The block is bored 30mm.
The 30mm diameter shaft on the right has an internal MT3 taper. It is a redundant shaft off a mini mill.
The shaft is a good tight sliding fit in the zinc block.
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↓ The block is drilled and tapped. The finger assembly is attached to the two inline holes on the top.
The block is fixed to the Universal Head Bracket by the 14mm stud on the side.
The 'nick' in the block (seen just above the stud) is used to index the block against the scale on the Universal Head Bracket.
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↓ The zinc block was not quite long enough, so a 'locking block' was attached to the end of it.
The MT3 shaft is locked by means of a split cotter arrangement.
Here is how the 'locking block' was made.
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↓ The 'locking block' is attached to the main block by only 2 socket screws, due to lack of space.
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↓ The block is aligned to the index marks on the bracket.
The ball handle locks the assembly on the bracket.
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↓ UNIVERSAL VICE

This is Matthew Tinkers' homemade Universal Vice.

 

click here to see the source and his write up.
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↓ Split Cotters are used to lock the rotating parts.
The vice consists of 3 "D" shapes, two of which have split cotters.
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↓ The base plate "D" is a little bigger than the others. The 20mm diameter CRS round was welded to the first "D" and the face that mates with the second was faced off.
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↓ A second stub was welded to the second "D" which was faced off to mate with the first using a stub of CRS locked with the split cotter.
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↓ The third "D" with the second split cotter with the vice mounting plate welded to it.
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↓ The vise is a 1" screwless from CTC Tools which is big enough for most lathe tools found in the home workshop.
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↓ Centre Brackets


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