On Monday 22 April 2019 05:04:50 Andy Pugh wrote: > On 22 Apr 2019, at 01:52, Gene Heskett <[email protected]> wrote: > >> holder to touch the spindle nose. > > > > Which might make it very marginally more rigid. > > More like an order of magnitude more rigid. > That would be a lot, but a lot of what, angstroms?
> It isn’t as simple as swapping a 19mm diameter for a 50mm one, but > even that indicates more than doubling the rigidity. > > In practice it is probably closer to the beam bending equations that > scale with the 4th power of radius. I'll have to measure the diameter of the load bearing flange on the ones I have (only 1 is genuine TTS, and I don't think any of them are a full 50mm) but would that not also depend on the drawbar pulling it into solid contact with the spindle nose around the R8, and never letting it use that leverage to pull it down to a zero preload condition?. To me that is ample reason to let the 20 volt rattle wrench rattle a bit longer. And to draw the clamping bolt of my homemade spindle lock a half turn tighter to prevent its slippage on the barrel. At some point changing the 4mm draw bolt there for a 5mm, and widening the slot as it stretches. At any rate the r8 bore and the TTS would both need to be washed out and or wiped down with an alcohol or acetone soaked paper towel to be as lubricant free as possible. Just handling them with normal shop contaminated hands would ruin that. The drawbolt of the G0704 has a small flange just below the square head, and a cap over that which I keep greased but the wear rate is still quite high as the bolt, which the flange hits the underside of the cap and functioned as eject leverage, took effect about 3/4 of a turn loose when it was new, but now needs 3 or 4 full turns to eject the R8, dropping the TTS into your hand, which needs contortions of the hand since the same hands thumb is pushing the lock pin into the hole in the spindle. I've bunged up more than one tool by not having a block of wood under it in case I miss the grab. Dings up the table too. Just one of the reasons I need to cobble up a tool changer for it also, one that does not take up table space. Thanks Andy, for pointing out an aspect of the TT System design I wasn't aware of. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
