Spring Tapping Guide

This topic has 14 replies, 6 voices, and was last updated 25 September 2019 at 15:23 by Vic.

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13 September 2019 at 15:36 #428844
Vic
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@vic
I have three of these and use them quite often but they have a common problem. They all have 1/2” bodies which is too large for one of the two smaller chucks I often like to use. Simple things I know but have any of you seen a drawing for a 10mm shank version to save me some time on the computer. TIA.
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13 September 2019 at 15:36 #19462
Vic
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@vic
13 September 2019 at 16:19 #428850
Thor 🇳🇴
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@thor
Hi Vic,

Years ago I made a simple one with 10mm OD, there is a simple sketch at the end of this pdf.

Thor
13 September 2019 at 18:05 #428859
Vic
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@vic
Thanks for that Thor.
13 September 2019 at 20:56 #428875
Howard Lewis
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@howardlewis46836
Could you turn down the OD of the shank, for as far as possible (without breaking into the innards )?

Howard
14 September 2019 at 02:56 #428896
not done it yet
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@notdoneityet
Posted by Vic on 13/09/2019 15:36:14:

They all have 1/2” bodies which is too large for one of the two smaller chucks I often like to use.

I think I would take the simple option and use the other chuck.

I have one chuck always holding a centre drill. Quicker to change the chuck than changing from centre drill to a larger drill bit. I don’t lose the centre drill as easily that way, too.
14 September 2019 at 08:04 #428900
Anthony Knights
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@anthonyknights16741
I made a spring centre using a MT2 blank. Just swop with the chuck when it needs to be used.
14 September 2019 at 11:06 #428932
Trevor Drabble 1
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@trevordrabble1
Vic , Are the ones from Arceuro not suitable ?

Trevor.

Edited By Trevor Drabble on 14/09/2019 11:07:22
14 September 2019 at 12:07 #428939
not done it yet
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@notdoneityet
Well done, Anthony. Simple and no need for a computer to design. KISS principle definitely in operation there.

Questions: Did you actually harden that point? If so, why?

added: good for the lathe. Not quite so fast, to change over, on the mill.

Edited By not done it yet on 14/09/2019 12:10:47
15 September 2019 at 13:36 #429080
Anthony Knights
Participant
@anthonyknights16741
Hi NDIY. The point isn't hardened. The oxide colours are a result of silver soldering the 10mm collar on the other end of the shaft.

edited to add photo

Edited By Anthony Knights on 15/09/2019 13:45:23
24 September 2019 at 18:58 #430300
Vic
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@vic
Posted by Trevor Drabble on 14/09/2019 11:06:25:

Vic , Are the ones from Arceuro not suitable ?

Trevor.

Edited By Trevor Drabble on 14/09/2019 11:07:22

Not sure. I did buy a commercial one once but it was so wobbly I had to ream the hole and make new innards to make it usable.

I’ve now made a 10mm shaft version so all sorted.

I have in the past resorted to just using a pointed length of steel in the chuck but not being spring loaded is less convenient.

As for turning down a 1/2” model, I doubt there’s enough material on the ones I have. One in particular has a 10mm grub screw in the back.
24 September 2019 at 21:38 #430337
not done it yet
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@notdoneityet
Posted by not done it yet on 14/09/2019 02:56:13:

Posted by Vic on 13/09/2019 15:36:14:

They all have 1/2” bodies which is too large for one of the two smaller chucks I often like to use.

I think I would take the simple option and use the other chuck.

I have one chuck always holding a centre drill. Quicker to change the chuck than changing from centre drill to a larger drill bit. I don’t lose the centre drill as easily that way, too.

Go on, tell us why you don’t use the other chuck. Seemed, to me, to be the obvious solution – but there must be a sensible reason why you don’t use the one (of the two) that is large enough?
24 September 2019 at 21:46 #430339
Vic
Participant
@vic
NDIY, the Z space on my mill can be limiting so it sometimes helps to use the smallest Chuck I have. There are other ways round it like using a collet direct in the spindle but for most jobs it’s more convenient to keep the chuck in the quill.
25 September 2019 at 08:55 #430364
not done it yet
Participant
@notdoneityet
Thanks for the reason. It just seemed the sensible way to go, because of the info provided in your thread opening post.

How much longer is this other small chuck? Is there scope to slightly shorten the spring-loaded tip of just one of your three tapping guides?

I was likely thinking ‘lathe’ and not ‘mill’ as well. Again, the comprehensive detail only emerges much later.
25 September 2019 at 15:23 #430431
Vic
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@vic
I’ve just checked and there is a 30mm difference between my Albrecht 16mm and Rohm 10mm. It doesn’t sound much but can make the difference with some jobs.
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