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Timleech
07-01-2009, 03:26 PM
I wanted to put a slotting head on my Elliott Omnimil combined turret/horizontal mill. It has a mounting face on the end of the overarm, just a flat face with four tapped holes. Chances of finding aN 'original' Elliott slotting head would be almost nil, plus there would be problems fitting it in the space available.
I thought I had the perfect answer when the little slotting head from a Town Woodhouse mill came up on ebay for a very good price. I had one of these some years ago when I had a TW turret mill, they're a nicely engineered unit, much smaller than the Bridgy head but a bl*8dy sight heavier! I thought the low height would be an advantage as my ceiling is low and the mill is tall.
In fact there were various ways in which it wouldn't have fitted in very well but I realised I could do the job with a Bridgeport unit. One of these had been on ebay locally a couple of times without selling, so when the price dropped further for the third time I jumped in.
Space is very tight in my place, I don't have room for a slotting head behind the mill, so I made up this bracket so that the Bridgeport head can be swung right round against the overarm.

First take a piece of 6" round bar (what was available on the day) and reduce it to the required 4.75" for the pivot.

http://i559.photobucket.com/albums/ss38/Timleech_2009/DSCF2448.jpg

Then bore to 7/8" for the pivot bolt, part off, and reface the other end to 3" thickness.
Next cut a 1" slot as a register for the mounting plate.

http://i559.photobucket.com/albums/ss38/Timleech_2009/DSCF2454.jpg

Next take a piece of 5" x 1" flat bar, bought for a specific job years ago but never used. Cut one end down to a whisker under 3" wide, and drill for the four mounting bolts. Face the reduced end square.
Then clamp the two together and weld securely

http://i559.photobucket.com/albums/ss38/Timleech_2009/DSCF2456.jpg

Then bolt the plate to the end of the overarm, and mount the slotting head in place.

http://i559.photobucket.com/albums/ss38/Timleech_2009/DSCF2460.jpg

(Edit) I'll probably add a couple of dowels to the mounting face before tackling any heavy cuts.

And here is the first job, a double keyway for an engine governor sliding sleeve. As well as being a double keyway, it's a non-standard bore because the male part has been skimmed below the nominal 1" dia so broaching would have needed a special undersize bush with a register slot at 180 degrees.

http://i559.photobucket.com/albums/ss38/Timleech_2009/DSCF2465.jpg

(linked because of limits on picture numbers)

With a little bit of care, the overarm (and therefore the whole mill) needs to be only a couple of inches further from the wall than before adding the slotter.

Tim

BadDog
07-01-2009, 04:26 PM
Very nice! Gotta love those deep cuts on a big lathe.

Hmmm, me thinks I have a new project...

I have my slotter slung to the side, but it still forces my mill out several inches further than otherwise required. And in a one-car detached garage, that makes a difference.