Re: [GrizHFMinimill] ER20 collet question.



Hi John,

<SNIP>
Suggest you buy metric collets as they overlap the Imperial standard sizes.
Imperials are normally in 1/16" (0.062") ranges where metric are 2-20 mm in increments of 1 mm (0.04").
</SNIP>

I agree with your advice about buying metric step size collets, but for a different reason to the one you give.

The full range of Imperial collets are in steps of 1/32 of an inch - this give a full range with no gaps but as each collet has a range of 1/32 (31 thou) rather than the 40 thou for the metric collets there are more Imperial collets than metric collets in a full set.  This means the Imperial set costs more.....

Of course the above is probably not correct in the USA where customers pay a premium for metric parts dur to the smaller volume sold.

All the best,
Ian




On 27 Dec 2015, at 08:51, "John Lindo bechetboat@yahoo.com [GrizHFMinimill]" <GrizHFMinimill@yahoogroups.com> wrote:

 

Check this link below.
ER 20 with a # 3 MT.
By going your way,reading your post,you are introducing another piece into the set.
Less stable.
Possibly you will need to buy piece of all stud 12 mm to replace your 3/8" x 16 drawbar.
The price is good,and you can even source the ER 20 collets from them.

But why ER 20 when you can fit the larger ER 32 set up,this gives you up to 20 mm dia holding capacity.

Suggest you buy metric collets as they overlap the Imperial standard sizes.
Imperials are normally in 1/16" (0.062") ranges where metric are 2-20 mm in increments of 1 mm (0.04").
You can already see the difference.
For example,you want to hold a dia of 0.59",the 9/16" is to small,the 5/8" is to large,without crushing down very hard on the collet,possibly causing distortion. but 15 mm collet is just right,said ("baby bear"). LOL

I buy direct from CTC tools on a regular basis.
Quality,price and shipping charges very reasonable.
It´s based in Hong Kong with a German manager and they have been around for many years,
but there is always a reluctance to purchase outside the US,don´t know why,as the parts you buy are 
possibly sourced from outside the US,and likely to be Hong Kong/China.



Hope this helps.
Happy new year to all the forum.

John
Spain.









On Sunday, December 27, 2015 5:28 AM, "j1g2004@yahoo.com [GrizHFMinimill]" <GrizHFMinimill@yahoogroups.com> wrote:


 
I am back seeking more advice.
 I am looking to switch from standard collets to a Tormach TTS style setup ,  I am looking at using ER20 collets, and was wondering if anyone has used the knock off from ebay. http://www.ebay.com/itm/161733955633?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT,

I am also wondering if they will work with the Tormach collet adapter. http://littlemachineshop.com/products/product_view.php?ProductID=2455.

Thanks again

Ed




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Posted by: Ian Newman <ian_new@yahoo.com>



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