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Swivelling mount for the Clarkson Mark 1 Tool and Cutter Grinder Universal Head

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This is a work in progress.
This Mount is for the Clarkson Universal Head.
The Universal Head is normally mounted on the Universal Head Bracket.
This swivelling Mount gives greater versatility in positioning workpieces.

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↓ Here is how I machined the base plate.

 

 

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↓ An M10 stud is secured to the base plate.

 

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↓ The swivel Mount was made from a large billet of mild steel.
The Mount was turned in the lathe, then cut using the bandsaw (that was fun).
The Mount was squared up using a fly cutter in the Mill.

↓ The mount is 90mm (3.5inch) diameter and 110mm (4.3inch) high

↓ The swivel Mount on the base plate.

 

↓ The base plate attaches to the table with the 2 original 1/2inch Whitworth T slot nuts and bolts.
The mount rotates 360 degrees.

↓ The Mount is rotated into position and locked down by the M10 nut.

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↓ The Universal Head is attached to the Mount using the original 1/2 Whitworth nut and bolt.
The blue bit is the Universal Head.
The round bit in the Universal head is a collar of a Holder that passes through the Universal Head casting.

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↓ For the exercise I made 2 brass screws to secure the Clarkson Holders in the Universal Head.
The threads are 1/2 inch Whitworth and were cut in the lathe. It was interesting to do.
I don't think the threads are perfectly accurate, but they fit the existing threads ok.

 

↓ The brass screws can stop that Holder rotating in the Universal Head with just a slight turn.

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↓ I made a brass tool holder to hold square lathe bits.
The toolbits are secured in the holder using the M3 grub screws.
The holder fits in one of the existing Clarkson Mandrels.
The surface marks on the brass tool holder were made by securing screws in the Clarkson Holder that it goes in.

 

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↓ The assembly in use.
The swivel Mount rotates 360 degrees in a horizontal plane.
The Universal Head rotates 360 degrees in a vertical plane.
The Mandrel can be rotated 360 degress within the Universal Head.

 

↓ The lever with the round knob operates the rack and pinion which traverses the table across the face of the cup wheel.
Hence, the toolbits being ground are passed back and forth across the flat on the cup wheel.
The handle at the bottom left controls the infeed of the table.

↓ The wheel can be moved up or down, in order to suit the work being ground.
The bolt just beyond the cup wheel is loosened, and a handle is used to adjust the height of the wheel.
You can just see the adjusting handle assembly at the top right of the picture, and also at bottom right.
The bolt is tightened before grinding begins.

↓ This is a 100 grit WA100KV cup wheel. It gives a good finish.

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Update Oct 2009.

It became a pain using spanners to adjust the mount, so I made some hand locks to speed things up.

↓ Here is the Mount Top Lock and the Mount Bottom Lock.
These work great and I am pleased with them.
I have borrowed the handles off the lathe while I decide on the ones I want.

↓ Here are the components of the Mount Top Lock.
This assembly replaces the original Whitworth nut and bolt used to secure the Universal Head.

 

 

 

 

 

 

 

 

↓ More views of the Mount Top Lock that secures the Universal Head.

 

 

 

 

↓ The round locking collar has a flat, to help locate the collar on the Universal Head.
The flat on the collar locates on the narrow flat step in the bottom of the gap. This prevents the collar from turning.
Clarkson owners will know how fiddly tight that space is.

 

↓ Here is the collar being tightened up.
Once the collar is on the thread and on the flat, it self locates and locks when the handle is turned.

 

↓ Here are the components of the Mount Bottom Lock.
The M10 stud is glued and screwed into the handle hub.

 

↓ View of the Mount Bottom Lock assembly.

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↓ I made a paper scale using Cad, printed it, and taped it on.
It is crude, but it works magnificently. Each mark is 5 degrees.
I will live with this for a while before I decide on how I am going to do proper scales. I will need to do 3.
I must tidy that sellotape up sometime.
The last two photos shows the Mount rotated 30 degrees.

 

 

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↓ I added a 1/2" square bar to the bottom of the base.
The bar is a nice snug fit in the T-Slot and this accurately positions the base on the table every time.
I did this because the mount needs to be indexed properly, so that the degree dials are correct.

 

 

↓ I machined the edges of the base to make them square.
I machined a small bevel using a Inverted Dovetail cutter.
I spent an evening filing most of the marks out of the top of the base plate.

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↓ I finally decided on the type of handles I wanted for the mount.
These are nice and simple.

 

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↓ I made a dial for the Universal Head.
image to follow
↓ I made a dial to fit the holders.
image to follow
↓ I made a dial for the swivel mount.
image to follow

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I love this machine.
I have done more stuff and will post photos soon.

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