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Gallery, Projects and General => How do I?? => Topic started by: Xldevil on March 22, 2010, 03:15:25 AM

Title: Boring QCTP base
Post by: Xldevil on March 22, 2010, 03:15:25 AM

Hello.
The hole in the base of the Dixon type QCTP I ordered from Chronos(actually it is made by Soba) is not quite 0.02mm too small,means the top slide´s tool post stud is 7/16" or 11.1125mm and the hole is 11mm.
Now that the steel of the base is hardened,can I bore it with an indexable boring bar and a CCMT tip?
I don´t want to turn down the stud,which isn´t hardened.I have another tool post in use which fits well.
Regards,Ralph

Title: Re: Boring QCTP base
Post by: websterz on March 22, 2010, 03:31:58 AM

Quote from: Xldevil on March 22, 2010, 03:15:25 AM

Hello.
The hole in the base of the Dixon type QCTP I ordered from Chronos(actually it is made by Soba) is not quite 0.02mm too small,means the top slide´s tool post stud is 7/16" or 11.1125mm and the hole is 11mm.
Now that the steel of the base is hardened,can I bore it with an indexable boring bar and a CCMT tip?
I don´t want to turn down the stud,which isn´t hardened.I have another tool post in use which fits well.
Regards,Ralph

You should be able to open it up with an inserted bar. There's not much material there to remove. If nothing else a Dremel with a fine grit stone will work.  :dremel:

Title: Re: Boring QCTP base
Post by: andyf on March 22, 2010, 04:17:41 AM

Will it matter too much if you turn the stud down by 0.02mm, so that your other toolpost is a slighly looser fit on it? When a toolpost is clamped down, it is the friction between its underside and the surface of the topslide which prevents it rotating while you are cutting, not the fit of the toolpost on the stud.

Emery paper would do the job, and would avoid having to set the stud to run exactly true, or having to find a bolt to hold the toolpost down while the stud is in the chuck.


Andy

Title: Re: Boring QCTP base
Post by: Davo J on March 22, 2010, 07:14:11 AM

Hi Ralph,
I have a Dickson as well, only a bit bigger model. One thing with boring it is, you might go through the case hardening, it might not matter, but I just thought it was something to think about. The stud would only have to go down 0.05625 either side, which shouldn't bother the thread.
Davo

Title: Re: Boring QCTP base
Post by: Xldevil on March 22, 2010, 04:58:59 PM

Hi.
Thank you all for the thoughts.
To turn down the stud that trifle seems to be the better option now.
Cheers,Ralph

Title: Re: Boring QCTP base
Post by: gldwight on April 20, 2010, 12:52:03 AM

OR turn another stud out of good steel, then temper it is another option.