Motive power for a toolpost spindle

[John Stevenson 1Participant @johnstevenson1]

I like Les's and Neils geared units on page one.

A while ago I butchered a perfectly good Machine Mart 1/2" capacity air drill to get the reduction unit out of to convert my air tapper to electric.

Reason was, to use it I have to run a big compressor for probably only a few holes so it tended to not get used. Now it's on electric it ready for just one or two holes, also the air one struggled a bit on M12 holes but the electric one can do M14 which is as big as my collets go.

But, and seeing these pictures and thinking about it I have some of these.

Desutter self feeding air drills which to be honest are not worth much second hand.

Plated bit is the gearbox and the black tube behind is the air motor and it sups some and more. Inside the control casting is the air cylinder that pushes the chuck and drive shaft out.

So chop it off behind the gearbox and fit one of these spurious 300w / 350w 450w 500w Chinese C2 / C3 mill motors and control board and you have a very nice unit ?

[Neil WyattModerator @neilwyatt]

John, that looks suspiciously like one of these:

[John Stevenson 1Participant @johnstevenson1]

It was in a far off galaxy…………………………………

[AjohnwParticipant @ajohnw51620]

The er16 collet holder arrived today. There are only a couple of ebayers selling er16 C16 200mm extensions. I went for the one with a hex nut to avoid special spanners. Much to my amazement the shaft is only a few microns out from 16mm. -5 at one end -1 at the other and a bit of a bulge in the middle that may be +1. The end where the main bearing would go shows the least error.

Only thing is that 16mm bore ball type bearings are thin on the ground. Weird as there are loads of 5/8". There are needle rollers but given how well Pultra bearings last if looked after I am wondering about sintered bronze. Maybe over 16mm bore and include a wear sleeve. That would just need a collar and thrust bearing at the other end. There are plenty of 16mm oil seals about.

John

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Edited By John W1 on 21/10/2015 13:44:48

Edited By John W1 on 21/10/2015 13:45:53

[donkeyParticipant @donkey]

actually they were built in cardiff john so i suppose you are almost correct and for a write up they were made using a cut off saw a myford ml7 and an axminster 25 mill in conjunction with a 6 inch rotary table mounted on an mdf jig for the angled holes.

bri

[Michael GilliganParticipant @michaelgilligan61133]

This little scratch-built lathe includes a neat drive arrangement for the cutter spindle.

MichaelG.

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