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Old 03-08-2019, 11:51 PM
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Default Collets

So what are the + and - of ER16 vs ER32 collets? The only thing I see is the ER16 are about 1/2 the price of ER32.
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Old 03-09-2019, 07:10 AM
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Sizing of the collet’s holding range, ER 32 goes up to 3/4”, while ER 16 only goes up to 7/16” in collet size
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Old 03-09-2019, 10:34 AM
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Originally Posted by platypus20 View Post
Sizing of the collet’s holding range, ER 32 goes up to 3/4”, while ER 16 only goes up to 7/16” in collet size
Well that leaves out the ER16. I want to be able to use 1/2" endmills. My column mill is only good for 1/2" endmills. I have used a 3/4 endmill, but you can tell the lug down some.
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Old 03-09-2019, 10:56 AM
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Just remember that some day I see a larger mill in your future.
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Old 03-09-2019, 11:31 AM
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Just remember that some day I see a larger mill in your future.
No plans at this time, but you never know what may come along.
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Old 03-09-2019, 12:41 PM
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Originally Posted by milomilo View Post
...I have used a 3/4 endmill, but you can tell the lug down some...
The best way to hold endmills in your machine is to use individual holders with an R8 shank, especially the larger sizes. I have a collet set but rarely use it. When running larger endmills (3/4" and up) they have a tendency to pull out because of the helix of the cutter. An endmill with a flat that is securely tightened into a holder will never move on you.

If you want to run larger endmills get yourself a few roughing (corncob) cutters. Run them at a slow RPM, run them deep and with a fairly heavy feed and you'll be amazed at how much material they'll remove. If I have to remove any amount of material on the mill I'll always run an undersize roughing cutter first and then finish up with a conventional endmill...
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Old 03-09-2019, 01:07 PM
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I guess everyone is different, I hate end mill holders, I’ve bought 3 expensive sets, and had terrible runout on all of them. I also use a lot of carbide end mills, and end mill holders are useless to them. Also a large percentage of the hiss end mills, I have, don’t have Weldon shanks. I also guess, I’m extremely lucky as I’ve never had an end mill move in any collet I’ve ever used.

To be sure Keith, has run larger machines, than I ever will, I have no doubt if he says it possible, it possible, I believe his experience. I always make use the collets and end mill shanks are clean and dry and use the required/recommended torque specs.
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Old 03-09-2019, 01:23 PM
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Yes I use R8 collets where possible.
I have never heard of a machine with zero run out.

Machining is always about the final product. knowing your equipment's limitations and achievable accuracy is what makes good work possible.
a POS machine might get to +- .002 at best using a $5 cutter that will maintain those tolerances while removing a 5 gallon pail full of swarf.
A $200,00 special machine might get to +- .00002 using a $40 cutter that needs replacement after a coffee Cup of cutting if you need the tightest tolerances.
While the equipment and tooling gets better and better it will never be perfect ... the quest for better accuracy never ends
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Old 03-09-2019, 01:50 PM
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Quote:
Originally Posted by LKeithR View Post
The best way to hold endmills in your machine is to use individual holders with an R8 shank, especially the larger sizes. I have a collet set but rarely use it. When running larger endmills (3/4" and up) they have a tendency to pull out because of the helix of the cutter. An endmill with a flat that is securely tightened into a holder will never move on you.

If you want to run larger endmills get yourself a few roughing (corncob) cutters. Run them at a slow RPM, run them deep and with a fairly heavy feed and you'll be amazed at how much material they'll remove. If I have to remove any amount of material on the mill I'll always run an undersize roughing cutter first and then finish up with a conventional endmill...
I did just pick up a couple roughing endmills. Have not yet used them.
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Old 03-11-2019, 12:15 AM
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Originally Posted by milomilo View Post
I did just pick up a couple roughing endmills. Have not yet used them.
By all means give them a try--I think you'll like them. Make your DOC about 2-3X the diameter of the cutter; spin them at 150-300 RPM (depending on cutter dia.); feed them pretty heavy and watch the chips pile up. With a little experimenting you'll quickly find the sweet spot. You can tell you've got it right when the cutter just chugs along with no sign of a struggle and lays down a pile of chips. On a smaller, lighter machine you won't find anything better for mass material removal...
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