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Posted by Kevin(Bluey) on July 3, 2008, 12:07 am
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Hi ,
I have been surfing sites like Chronos , RDG and RHR looking for some
tooling and I noticed the number of different collets available ,
this is leading to some confusion on my behalf.
Just wondering why there are so many differnt collets , there are ER
32, ER35, ER40 etc and probably a heap more that I have not seen or
heard off .
What are differences and advantages one over the other.?
The ones I remember from my trade days were threaded and were drawn into
the lathe spindle using a draw bar and hand wheel on the out board end
of the spindle.
(Hope I'm not telling my age here.)
I'm not looking to buy any , as I have a full set of what I think are
Myford collets and a chuck that came with the Super 7 . There is one
"ring in" in the set it has Hardinge stamped on it and is slightly
different in the profile (concave)on the front face.
I don't use them a lot ,but if you are machining lots of parts from
small diameters they would make life easier.
Thanks .
--
Kevin (Bluey)
"I'm not young enough to know everything."
bluey69@west.net.com.au
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Posted by David Littlewood on July 3, 2008, 5:31 am
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>Hi ,
>I have been surfing sites like Chronos , RDG and RHR looking for some
>tooling and I noticed the number of different collets available ,
>this is leading to some confusion on my behalf.
>
> Just wondering why there are so many differnt collets , there are ER
>32, ER35, ER40 etc and probably a heap more that I have not seen or
>heard off .
>What are differences and advantages one over the other.?
>
>The ones I remember from my trade days were threaded and were drawn
>into the lathe spindle using a draw bar and hand wheel on the out board
>end of the spindle.
>(Hope I'm not telling my age here.)
>
>I'm not looking to buy any , as I have a full set of what I think are
>Myford collets and a chuck that came with the Super 7 . There is one
>"ring in" in the set it has Hardinge stamped on it and is slightly
>different in the profile (concave)on the front face.
>I don't use them a lot ,but if you are machining lots of parts from
>small diameters they would make life easier.
>
>Thanks .
The great advantage of ER collets is that their double taper means they
can close down by 1.0mm (0.5 for the very small sizes) and still
maintain excellent grip and concentricity. Collets with a single taper
will only work efficiently for material of the exact diameter of the
collet; even normal mild steel (usually a few thou under nominal) can be
a problem with single taper collets.
This means that a set of ER collets will grip anything within their
range - you don't need a metric set and an imperial set, for instance.
They will grip milling cutters effectively. The collets themselves do
not need a drawbar as the double taper holds them in; it is the collet
chuck itself that needs a drawbar, at least when holding milling
cutters.
The different numbers are just sizes. ER25 (the set I use) goes from 1.0
to 16.0 mm; the larger sets have a correspondingly larger range.
David
--
David Littlewood
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Posted by Kevin(Bluey) on July 3, 2008, 5:47 am
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> The great advantage of ER collets is that their double taper means they
> can close down by 1.0mm (0.5 for the very small sizes) and still
> maintain excellent grip and concentricity. Collets with a single taper
> will only work efficiently for material of the exact diameter of the
> collet; even normal mild steel (usually a few thou under nominal) can be
> a problem with single taper collets.
>
> This means that a set of ER collets will grip anything within their
> range - you don't need a metric set and an imperial set, for instance.
> They will grip milling cutters effectively. The collets themselves do
> not need a drawbar as the double taper holds them in; it is the collet
> chuck itself that needs a drawbar, at least when holding milling cutters.
>
> The different numbers are just sizes. ER25 (the set I use) goes from 1.0
> to 16.0 mm; the larger sets have a correspondingly larger range.
>
> David
David ,
Thanks for clearing that up .
I thought it was some evil conspiricy to extract more folding green from
our pockets by having to buy a set of each because of some manufactured
difference.
--
Kevin (Bluey)
"I'm not young enough to know everything."
bluey69@west.net.com.au
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Posted by David Littlewood on July 3, 2008, 6:44 am
Please log in for more thread options >
>> The great advantage of ER collets is that their double taper means
>>they can close down by 1.0mm (0.5 for the very small sizes) and still
>>maintain excellent grip and concentricity. Collets with a single taper
>>only work efficiently for material of the exact diameter of the
>>collet; even normal mild steel (usually a few thou under nominal) can
>>be a problem with single taper collets.
>> This means that a set of ER collets will grip anything within their
>>range - you don't need a metric set and an imperial set, for instance.
>>They will grip milling cutters effectively. The collets themselves do
>>need a drawbar as the double taper holds them in; it is the collet
>>chuck itself that needs a drawbar, at least when holding milling
>>cutters.
>> The different numbers are just sizes. ER25 (the set I use) goes from
>>1.0 to 16.0 mm; the larger sets have a correspondingly larger range.
>> David
>
>
>David ,
>Thanks for clearing that up .
>I thought it was some evil conspiricy to extract more folding green
>from our pockets by having to buy a set of each because of some
>manufactured difference.
>
Just to make sure there is no confusion, I should explain that the
different sets are different in size. They are not interchangeable
between sets. I think it would be unfair to say this is done to extract
more money, just that there is a set appropriate for your equipment.
Thus, for my lathe (S7) and milling machine (Emco FB2) the ER25 size is
about right; the holders for the larger sets would be inconveniently
large for the 2MT spindle. The "25" in ER25 refers, I think, to the
widest part of the chuck taper, the actual collets are about 26mm at
their widest point.
Don't let the profusion put you off, just find the right size for your
machinery and buy a set, you will find them invaluable.
See, for example:
http://www.arceurotrade.co.uk/Catalogue/Collets/ER-Collets-Collet-Chucks
Not sure, reading my previous post, that this was clear.
David
--
David Littlewood
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Posted by Kevin(Bluey) on July 3, 2008, 10:10 am
Please log in for more thread options David Littlewood wrote:
>>
>>> The great advantage of ER collets is that their double taper means
>>> they can close down by 1.0mm (0.5 for the very small sizes) and still
>>> maintain excellent grip and concentricity. Collets with a single
>>> taper only work efficiently for material of the exact diameter of the
>>> collet; even normal mild steel (usually a few thou under nominal) can
>>> be a problem with single taper collets.
>>> This means that a set of ER collets will grip anything within their
>>> range - you don't need a metric set and an imperial set, for
>>> instance. They will grip milling cutters effectively. The collets
>>> themselves do need a drawbar as the double taper holds them in; it is
>>> the collet chuck itself that needs a drawbar, at least when holding
>>> milling cutters.
>>> The different numbers are just sizes. ER25 (the set I use) goes from
>>> 1.0 to 16.0 mm; the larger sets have a correspondingly larger range.
>>> David
>>
>>
>> David ,
>> Thanks for clearing that up .
>> I thought it was some evil conspiricy to extract more folding green
>> from our pockets by having to buy a set of each because of some
>> manufactured difference.
>>
> Just to make sure there is no confusion, I should explain that the
> different sets are different in size. They are not interchangeable
> between sets. I think it would be unfair to say this is done to extract
> more money, just that there is a set appropriate for your equipment.
> Thus, for my lathe (S7) and milling machine (Emco FB2) the ER25 size is
> about right; the holders for the larger sets would be inconveniently
> large for the 2MT spindle. The "25" in ER25 refers, I think, to the
> widest part of the chuck taper, the actual collets are about 26mm at
> their widest point.
>
> Don't let the profusion put you off, just find the right size for your
> machinery and buy a set, you will find them invaluable.
>
> See, for example:
>
> http://www.arceurotrade.co.uk/Catalogue/Collets/ER-Collets-Collet-Chucks
>
> Not sure, reading my previous post, that this was clear.
>
> David
All clear and understood.
I had that link bookmarked , and will check it out again.
Not sure I'll buy a set just yet ,I still have the Myford collet set
,But these below would be able to fit my drill press and a future mill
with the MT 2 chuck.
I have some other tooling I want to get first
Found this set on the Bay ,price is good ,not sure on the quality ,
made in the Peoples Republic of C .
http://cgi.ebay.com.au/FULL-ER25-COLLET-SET-15-PCS-CNC-MILLING-LATHE-NEW-A05_W0QQitemZ110265889934QQihZ001QQcategoryZ25294QQtcZphotoQQcmdZViewItemQQ_trksidZp1742.m153.l1262
and the MT 2 chuck ,
http://cgi.ebay.co.uk/ER25-MT2-3-8-COLLET-CHUCK-CNC-MILLING-LATHE-NEW-A68_W0QQitemZ110265134618QQihZ001QQcategoryZ12584QQtcZphotoQQcmdZViewItemQQ_trksidZp1742.m153.l1262
On the collet page if you scroll down he has a handy chart with all the
collet sizes etc.
Thanks again
--
Kevin (Bluey)
"I'm not young enough to know everything."
bluey69@west.net.com.au
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>I have been surfing sites like Chronos , RDG and RHR looking for some
>tooling and I noticed the number of different collets available ,
>this is leading to some confusion on my behalf.
>
> Just wondering why there are so many differnt collets , there are ER
>32, ER35, ER40 etc and probably a heap more that I have not seen or
>heard off .
>What are differences and advantages one over the other.?
>
>The ones I remember from my trade days were threaded and were drawn
>into the lathe spindle using a draw bar and hand wheel on the out board
>end of the spindle.
>(Hope I'm not telling my age here.)
>
>I'm not looking to buy any , as I have a full set of what I think are
>Myford collets and a chuck that came with the Super 7 . There is one
>"ring in" in the set it has Hardinge stamped on it and is slightly
>different in the profile (concave)on the front face.
>I don't use them a lot ,but if you are machining lots of parts from
>small diameters they would make life easier.
>
>Thanks .