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Posted by Boo on August 22, 2006, 9:41 am
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> No argument from me John. I use both my autolock and ER32 chucks where
> appropriate (and an ER25 in my Myford lathe) . I think it's important to
> point out to someone new to these things that you sometimes have to tighten
> the ER chucks very tight indeed o get the needed grip. As I said, in the
> case of a 1/4" parallel shank cutter I can't get my ER32 with a 6- 7mm
> collet tight enough to grip for milling safely. Now if the chuck had
> spanner flats or the mill a spindle lock!
Speaking of which, does anyone know a good scheme for fitting a VMC with a
spindle lock ? It does seem like an oversight in the design. I tighten my
collets by putting a spanner on the drawbar nut but it's a bit of a faff.
--
Boo
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Posted by on August 22, 2006, 10:42 am
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Norman Billingham wrote:
(snip)
>
> No argument from me John. I use both my autolock and ER32 chucks where
> appropriate (and an ER25 in my Myford lathe) . I think it's important to
> point out to someone new to these things that you sometimes have to tighten
> the ER chucks very tight indeed o get the needed grip. As I said, in the
> case of a 1/4" parallel shank cutter I can't get my ER32 with a 6- 7mm
> collet tight enough to grip for milling safely. Now if the chuck had
> spanner flats or the mill a spindle lock!
This subject has been confusing me, how could you not tighten the
collet? It's easy, spanner on the chuck body and tighten the collet nut
with the C spanner, at least that is what I thought. My 3MT vertex
chuck has spanner flats and so I stupidly assumed they all did, I now
notice that all of the R8 chuck bodies I can find pictured on the net
don't have the flats. Is that the standard for R8? If so, can't you
grind some suitable flats on the chuck body where there is no spindle
lock fitted? I must admit going by my Vertex chuck it appears too hard
to do anything else but grind.
I don't like the BANG that I get when releasing the 6-7mm collet after
holding a 1/4" shank cutter so I can imagine that it would be difficult
to get it sufficiently tight without a secure locking method. Could go
a long way to explain why I was so incredulous at anyone having a
cutter pull out of a ER collet, well you learn something new every day.
Best regards
Keith
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Posted by on August 22, 2006, 12:22 pm
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Norman Billingham wrote:
> No argument from me John. I use both my autolock and ER32 chucks where
> appropriate (and an ER25 in my Myford lathe) . I think it's important to
> point out to someone new to these things that you sometimes have to tighten
> the ER chucks very tight indeed o get the needed grip. As I said, in the
> case of a 1/4" parallel shank cutter I can't get my ER32 with a 6- 7mm
> collet tight enough to grip for milling safely. Now if the chuck had
> spanner flats or the mill a spindle lock!
You can get inch series ER collets, at least on this side of the water.
http://www1.mscdirect.com/CGI/NNPDFF?PMPAGE=1568&PARTPG=N2DRVSH&PMT4NO=10930297&PMITEM=09692260&PMCTLG=00&PMT4TP=*LTIP
___________
Andre' B.
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Posted by John Stevenson on August 22, 2006, 12:43 pm
Please log in for more thread options On 22 Aug 2006 09:22:37 -0700, andre_54005@yahoo.com wrote:
>
>Norman Billingham wrote:
>> No argument from me John. I use both my autolock and ER32 chucks where
>> appropriate (and an ER25 in my Myford lathe) . I think it's important to
>> point out to someone new to these things that you sometimes have to tighten
>> the ER chucks very tight indeed o get the needed grip. As I said, in the
>> case of a 1/4" parallel shank cutter I can't get my ER32 with a 6- 7mm
>> collet tight enough to grip for milling safely. Now if the chuck had
>> spanner flats or the mill a spindle lock!
>
>
>You can get inch series ER collets, at least on this side of the water.
>http://www1.mscdirect.com/CGI/NNPDFF?PMPAGE=1568&PARTPG=N2DRVSH&PMT4NO=10930297&PMITEM=09692260&PMCTLG=00&PMT4TP=*LTIP
>
>___________
>Andre' B.
Sorry but I have to smile at these metric / imperial collets.
J&L being a US company sell the same, ironically the imperial ones are
cheaper than the metric ones.
But look carefully at Andre's link above.
Go to the ER32 and look at the 1/4" one for range - 0.236" to 0.275"
which so happens to be 6 - 7 mm :-)
Before Ketan at Arc Euro started stocking these I used to buy the
imperial ones from J&L .
They used to come boxed 1/4" but the collet was etched 7 - 6 ??
There are some genuine imperial ones that do start at 1/4" as an
example but they are costly and special order.
.
--
Regards,
John Stevenson
Nottingham, England.
Visit the new Model Engineering adverts page at:-
http://www.homeworkshop.org.uk/
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Posted by on August 22, 2006, 1:02 pm
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John Stevenson wrote:
> Sorry but I have to smile at these metric / imperial collets.
> J&L being a US company sell the same, ironically the imperial ones are
> cheaper than the metric ones.
> But look carefully at Andre's link above.
> Go to the ER32 and look at the 1/4" one for range - 0.236" to 0.275"
> which so happens to be 6 - 7 mm :-)
>
> Before Ketan at Arc Euro started stocking these I used to buy the
> imperial ones from J&L .
> They used to come boxed 1/4" but the collet was etched 7 - 6 ??
>
> There are some genuine imperial ones that do start at 1/4" as an
> example but they are costly and special order.
>
> .
> --
> Regards,
>
> John Stevenson
> Nottingham, England.
>
> Visit the new Model Engineering adverts page at:-
> http://www.homeworkshop.org.uk/
Crap those are just rebadged mm collets.
I know we have some 1/2 and 3/8 collets here and as I remember they
were not that big of a deal to get.
Have to find out where they came from.
__________________
Andre' B.
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> appropriate (and an ER25 in my Myford lathe) . I think it's important to
> point out to someone new to these things that you sometimes have to tighten
> the ER chucks very tight indeed o get the needed grip. As I said, in the
> case of a 1/4" parallel shank cutter I can't get my ER32 with a 6- 7mm
> collet tight enough to grip for milling safely. Now if the chuck had
> spanner flats or the mill a spindle lock!