SC4 Tailstock, Tangs and JT2 Drill Chuck

[Mark Elen 1Participant @markelen1]

Hi all,

I’m now the proud owner of a Seig SC4. As part of the ‘pile of bits’ I bought with it, I got a MT2 to JT2 arbour with a tang.

Now, here’s the newbie question. There is no tang slot in the tailstock, so on assembly, I can grab hold of the Chuck and spin it off either the JT2 or sometimes off the MT2 by hand, as in it’s not holding. Surely trying to drill something like this will not work…?

What’s the score?

Any pointers would be much appreciated.

Cheers

Mark

[Mark Elen 1Participant @markelen1]

[JasonBModerator @jasonb]

How did you "assemble" the chuck to the JT2?

Edited By JasonB on 15/11/2018 20:19:50

[Mark Elen 1Participant @markelen1]

Hi Jason,

It’s just on a taper. I did try assembling and with the Chuck uppermost, tapping the tang onto a block of wood.

Is it that I’m not tapping hard enough?

Cheers

Mark

[JasonBModerator @jasonb]

That usually does it, make sure you have wiped off all the chicken fat first with some solvent

[Mark Elen 1Participant @markelen1]

I guess the tailstock is the same? It just needs cleaning out and a bit more oomph to seat it properly?

I’ll admit, I haven’t got any of it cleaned up properly yet.

Cheers

Mark

[FarmboyParticipant @farmboy]

A few points:

1. The tang is not there to stop the arbour turning, the morse taper does that.

2. The Morse Taper and the JT2 only hold under pressure, e.g. when drilling. If you twist and pull it will come out unless it has been forced tight by use . . . or a big hammer ( which is NOT recommended )

3. On the tailstock the Morse taper is released when the spindle is fully withdrawn, and the arbour may drop out.

Hope that is some help.

Mike.

[Mark Elen 1Participant @markelen1]

Thanks Gents👍

Ill get it all cleaned up and have a go. First job is to make up a new stud for the QC Toolpost and find someone to surface grind my toolholders. I got the 111 wedge post and the holders need 4.5mm off the bottom.

It’s all good fun!

Cheers

Mark

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