If the TTS is so awesome, why do I get horrible chatter with a 3/8 end mill?

[dertsap]

I just looked at the tooling for the tormach and hadn't realized before now that they are not tapered holders which has thrown out any of my thoughts of buying one in the near future . Anyhow length can definitely be a contributing factor with a design like that

[TXFred]

So you can't take a holder from one machine and swap it with another ?

From earlier discussion with beanbag in another thread, I learned that he doesn't have a Tormach of his own. He has two friends who let him use their machines. But if he started walking out the door with their tool holders, he'd probably lose privileges.

Frederic

[Peter Neill]

As I mentioned a while ago, I swapped between different holders, but that is only within the set that comes with each machine.
I kind of came to the realization yesterday that the set that comes with the more chattery machine looks longer than the set that comes with the less chattery machine. I'll have to measure the length on the other machine to see if they are the same. No, I can't take the collets on one machine and bring them to the other. What does your ER holder measure out to?

Quite possibly they are different, I've noticed (just from the interweb rather than 1st hand experience), that they have changed the geometry of the TTS holders since the ATC was introduced.
You can see the difference below,both are 5/16" holders.

[David Bord]

Gib tightness can impact chatter as well correct?

David

[TXFred]

Gib tightness can impact chatter as well correct?

Absolutely.

[David Bord]

Absolutely.

Thats what I thought. This could also be the difference in chatter between the two machines he has access to.

David

[300sniper]

This is also confusing, the ER holder is no longer than the weldon type holder as far as I recall.

Phil

The weldon holder is .8" shorter than then ER20 holders.

my tts holders are older so they may have changed, if not changed several times since. without being too technical, i put a calliper next to each and my 1/2" weldon holders are approximately .4" shorter than my er20 holders.

[beanbag]

Thats what I thought. This could also be the difference in chatter between the two machines he has access to.

David

I doubt I have a gib or spindle bearing issue because going to a R8 collet fixes it. I also don't see how a loose gib can cause a squealing chatter because the frequency is too high. Maybe a rumbling chatter?

Anyway, I measured the length of the other ER collets, and they were only 2" long. That extra .5" on McChatterton makes a big difference because the deflection probably increases as the length ^2, or something like that. (I don't think the ER holder itself is bending much, but rather mostly at the TTS/R8 junction.)

[nitewatchman]

If the TTS System is not working for you, you really shouldn't use it - stick to R8's.

Works okay for me. I may have lower standards?

nitewatchman

[Don Clement]

Sir Wilfrid: Be prepared for hysterics and even a fainting spell. Better have smelling salts handy and a nip of brandy.

Christine Vole: I do not think that will be necessary. I never faint because I am not sure that I will fall gracefully and I never use smelling salts because they puff up the eyes. I am Christine Vole.