Tag Archives: mill

S&P (Stothert & Pitt) Part 2 Slotting the columns

The tapered columns are slotted along their whole length to allow the laser cut side panels to slot inside them. So a fixture needed making.

The fixture is made from a block of aluminium

The taper needed supporting on some sort of fixture, so I made a simple holding clamp out of aluminium bar, and made three small clamps to hold the column firmly in place.

The completed fixture with the three clamps

I used a slitting cutter 1/6th inch wide to cut the slots, this gave a nice fit for the 1.6mm wide plate after I polished both sides. Taking very small depth of cuts of about 10 thou, I cut down to full depth. The fixture worked very well on all four columns.

The four slotted columns

It seemed a shame that it wouldn’t be used again so I adapted it to hold the four brass finials and column bases which also needed a slot cutting into them.

I re-used the fixture to hold the brass finials because they needed slotting too
The mild steel column bases needed slotting too

Milling vice clamps

I have recently bought a precision tool makers milling vice. It is quite compact at 70mm jaw width but will do most of what I want to do on my machines.

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But I wanted to have dedicated table clamps for the new vice, and had to make some, four to be precise.

So starting out with a short piece of aluminium bar I milled a step into it, this is so the clamps will sit nicely on the table, the step is just proud enough to allow the clamping force to be exerted onto the vice and give a firm grip. In the photo a 45 degree chamfer is being machined along the long edges for a more pleasing look.

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The aluminium bar is cut into four pieces and milled on all sides to make all four pieces the same size.

I am using 6mm hold down studs made from 6mm bolts. A clearance hole is drilled into each clamp.

I had four spare Tee nuts so I didn’t need to make those.

Now I need four 6mm washer faced nuts. These are made from a length of 1/2″ diameter free cutting mild steel.

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I machined them one at a time, transferring between the lathe and milling and back again, a bit tedious but it got the job done.

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The hexagon flats were milled using the excellent ‘Stevensons collet block’ from Arc Euro Trade. All that is needed to make a hexagon is to grip the bar in the collet chuck and then mill a flat at the required depth and width, then undo the vice and rotate the collet block one flat and repeat until all six sides are completed. Then each nut was parted off in the lathe and chamfered.

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The clamps work well and although they are made from aluminium they should give long service in my small workshop, if they were subjected to any heavy work I would make them out of mild steel.

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