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Posted by Richard Edwards on May 23, 2008, 1:46 am
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I have a set of ER32 collets and am considering making a collet chuck
for my Viceroy Lathe. It would be similar to the ERM100 shown on
http://chronos.ltd.uk/acatalog/Myford_Lathe_Compatible_Acessories.html
The only question is what material? As this is going to screw onto the
spindle chuck mount 1.5 inch x 8 TPI I feel that Cast Iron would be
best, though I am a bit concerned about the longevity of the
relatively fine Collet nut thread.
Opinions?
Obviously my existing collet head fits the MT3 spindle taper but does
not allow bar "up the spout". Overhang would also be reduced with a
proper spindle mount head.
--
Richard
Email address is valid but remove burrs before sending!
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Posted by on May 23, 2008, 4:54 am
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On 23 May, 06:46, Richard Edwards
> I have a set of ER32 collets and am considering making a collet chuck
> for my Viceroy Lathe. It would be similar to the ERM100 shown onhttp://chr=
onos.ltd.uk/acatalog/Myford_Lathe_Compatible_Acessories.html
>
> The only question is what material? As this is going to screw onto the
> spindle chuck mount 1.5 inch x 8 TPI I feel that Cast Iron would be
> best, though I am a bit concerned about the longevity of the
> relatively fine Collet nut thread.
>
> Opinions?
>
> Obviously my existing collet head fits the MT3 spindle taper but does
> not allow bar "up the spout". Overhang would also be reduced with a
> proper spindle mount head.
>
> --
>
> Richard
>
> Email address is valid but remove burrs before sending!
Richard Hi, I made one of this type of collet chuck several years ago
for my Boxford which has the same spindle nose thread as your Viceroy.
I adapted a design that was published in EIM in 2003 (check your mail)
and it has worked hard with no problem whatsoever. I made mine from a
piece of "free cutting mild steel" I bought from my local stockholder;
at the time enough to make three bodies cost =A315. The nuts were made
from the same material. While I haven't been in the shop much over the
last 6 months prior to that they were in almost daily use for three
years and show few signs of wear. I do take the trouble to keep them
really clean though as the relatively "soft" collet seat would no
doubt mark with any chips. I did think of using a "hardening" steel
but decided that I could just recut the seat if, at any time, it
showed any damage; it hasn't yet. If you are using these in a
professional shop then something more exotic might be justified.
The closing force required on the nut, particularly when holding
imperial sizes in the metric collets is quite large and I'm not sure I
would be confident using Cast Iron. I've not got time to "do the
maths" on the thread strength but just feel that steel would be much
better in this situation, particularly if you ever need to hold a
milling cutter in the chuck. These nuts which are the most "trying"
part to make are now available form several suppliers at reasonable
cost if you feel flush, I found the exercise interesting so made my
own.
The last collet chuck I needed was for my BH600 and as time is
currently short I bought a backplate mounted version from
ArcEuroTrade. This has been excellent and once set up (easy with the
backplate mounting) has proven to be accurate and repeatable. While
many think the overhang would be increased with this type it is
actually the same as the Boxford one I made.
Apologies for another rushed response and on this occaision my
"opinion" is born purely of experience, I just haven't had the time to
do the research and thought for a "theoretical" response.
Best regards
Keith
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Posted by Tony Jeffree on May 23, 2008, 5:02 am
Please log in for more thread options On Fri, 23 May 2008 01:54:25 -0700 (PDT), jontom_1uk@hotmail.com
wrote:
>The nuts were made
>from the same material.
You can buy ER32 collet nuts and wrwnches from Arc Eurotrade:
http://www.arceurotrade.co.uk/Catalogue/Collets/ER-Collets-Collet-Chucks/ER32-Collets
Come to that, they sell backplate fitting chucks which is a lot easier
than making your own. I have their ER25 backplate chucks on my Myford
and my Peatol.
Regards,
Tony
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Posted by jackary on May 23, 2008, 5:48 am
Please log in for more thread options > On Fri, 23 May 2008 01:54:25 -0700 (PDT), jontom_...@hotmail.com
> wrote:
>
> >The nuts were made
> >from the same material.
>
> You can buy ER32 collet nuts and wrwnches from Arc Eurotrade:
>
> http://www.arceurotrade.co.uk/Catalogue/Collets/ER-Collets-Collet-Chu...
>
> Come to that, they sell backplate fitting chucks which is a lot easier
> than making your own. I have their ER25 backplate chucks on my Myford
> and my Peatol.
>
> Regards,
> Tony
Tony
I have made an ER32 collet, chuck for a lathe I have been making, from
mild steel and it seems ok so far. I made it from 3" bar and it has a
1.875 x 16 tpi nut I also made. To avoid making the eccentric removal
part I made two .312" dia x .040 thick washers csk for 6 BA screws.
The washers were made from silver steel hardened and tempered. I
fitted the washers on an 18.5mm pcd at 120 degrees to each other
inside the nut instead of the eccentric extractor. The collet can be
easily fitted in the same manner as for the eccentric nut. The
dimensions are just a guide.
Regards
Alan
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Posted by Tony Jeffree on May 23, 2008, 11:41 am
Please log in for more thread options On Fri, 23 May 2008 15:43:06 +0100, "Steve"
>(Except for a live centre, because I want a specific form factor, so I'm
>going to make one, it's a disease i think, I can't help it, but it
>doesn't appear to damage the liver, are there clinics to help with this?)
My guess is that it will only damage the liver if you take more than
one per day...its what you have to wash it down with that causes the
problems <G>
Regards
Tony
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> for my Viceroy Lathe. It would be similar to the ERM100 shown onhttp://chr=