I’ve had good luck with Maritool hydraulic chucks in CAT40. Haven’t tried to push them to the limit yet, but I’ve done about 400 IPM with a 3 flute 3/8" endmill and it was basically silent. Haven’t tried shrink fit holders.
> On Nov 10, 2022, at 1:21 PM, Stuart Stevenson <stus...@gmail.com> wrote: > > I don't remember seeing anything in the booth about the size of the holder. > I did comment to the booth attendant about the need for the 'threaded' > shank if the holders held so well. She just smiled. > > On Thu, Nov 10, 2022 at 8:02 AM Thaddeus Waldner <thadw...@gmail.com> wrote: > >> A key advantage of the shrink-fit toolholder is that the clamping part is >> much smaller than anything else. These holders are often specialized for >> accessing deep pockets. >> >>> On Nov 10, 2022, at 6:31 AM, Stuart Stevenson <stus...@gmail.com> wrote: >>> >>> Gentlemen, >>> I walked into a booth at IMTS a few cycles ago. This booth was a cutter >>> manufacturer touting the shrink fit tooling and heat shrink machine they >>> manufacture. All the propaganda focused on how the shrink fit process >> holds >>> the tool better than any other method. As I was looking at the line of >>> cutters in the display I saw an end mill with a spiral groove on the end >> of >>> the shank portion. I asked what that was for. I was told this was >> developed >>> to prevent the cutter from being pulled out of the adapter during high >>> speed cutting. It also prevented cutter spin in the adapter. >>> I have never owned or tried shrink fit tooling. >>> I have wasted my money on the so-called "hydraulic" collet holders. The >>> holders' performance was an absolute joke. >>> The ONLY non spinning/pullout end mill holder(adapter) I have seen is a >>> mechanical (ie weldon) style. >>> I will say my high speed experience is limited to a 14,000 rpm 50 taper >>> spindle but if the cutter manufacturer had to develop a mechanical slot >> to >>> prevent spinning/pullout maybe the focus to prevent spinning/pullout >> should >>> be mechanical even at the bridgeport level. >>> Just sayin >>> HTH >>> Stuart >>> >>> >>> On Thu, Nov 10, 2022 at 2:34 AM gene heskett <ghesk...@shentel.net> >> wrote: >>> >>>> On 11/10/22 02:48, John Dammeyer wrote: >>>>> >>>>>> From: gene heskett [mailto:ghesk...@shentel.net] >>>>>> It works well John, on the go704. I'd like to come up with a qcth >> holder >>>>>> for them on the Sheldon as it has the torque to drive much bigger taps >>>>>> but haven't quite figured out how to make such a critter, plus the >>>>>> sheldon has no gibs to constrain the carriage from being lifted clear >> of >>>>>> the ways when huge gobs of the torque reaction comes into play. I'd >> need >>>>>> to hang another 30 lbs on the back end of the crossfeed to contain >> that >>>>>> for say a 3" tap. That in any event even though I have the tap that >> big, >>>>>> is a g76 job. But at a 3" size, I'd be longer shaping the boring tool >>>>>> that doing it, my CBN wheels are quite fine, 2500 grit but fine is >> also >>>>>> slow, fragile and expensive. >>>>> >>>>> Hi Gene, >>>>> I'm mostly using the TTS holders and some of my more expensive tooling >>>> is still R8 so I'm not converting over completely. >>>>> >>>>> I'm thinking that your approach with 4 set screws to hold the tap might >>>> work well with TTS holders. A custom holder with a hole for the tap >> shank >>>> and 4 set screws keeps the tap from turning. >>>>> >>>>> Now we're back to the original question I posed. If this TTS holder >>>> with a 3/4" shank into the custom R8 holder with say 20 ft-lbs torque on >>>> the drawbar won't turn then it's fine for tapping up to the tap size. >>>> Since the TTS come with at least 1/2" holes it makes for a reasonably >> large >>>> tap. Up to 7/8" shank which is once again listed as the limit for R8. >>>>> >>>>> And it makes the tap holders a lot less expensive than using ER20 >>>> collets which are only good up to a certain size. Purchase a TTS for >> 1/4" >>>> shaft, mount in a lathe collet and bore to the size of the target tap. >>>> Drill the 4 holes and tap them. Now it's a TTS Tap holder. >>>> >>>> And I'm having a hard time visualizing that, can you scribble up >>>> something and put it on your web site? >>>> >>>>> If one wanted to modify the spindle it would be possible to put a pin >>>> hole just outside the diameter of the TTS tool. Then modify the TTS tap >>>> holder to have a flange like the pin on your holder that goes into the >>>> collet. >>>>> >>>>> In fact, modify all the TTS holders to have the flange and it's >> possible >>>> to prevent all TTS tools from spinning in the R8 holders. Not only that >>>> but the M66 command can put the pin in the same place so installing TTS >>>> indexed tools becomes trivial. >>>> >>>> The word flange is confusing me unless its used to establish a constant >>>> length to put in the tool table as TLO. And that would still be subject >>>> to error from inconsistent tightening of the drawbar. >>>> >>>> My next mechanical thing on the go704 will be stripping a 1/4 ratcheting >>>> screwdriver motor out, and rigging it on old 3d printer screws to >>>> reengage/disengage from the drawbar, It has the torque I think, to break >>>> the drawbar or strip its threads in left to hammer the bar for more than >>>> 1 or 2 seconds. Then rig M6 to run it for tool changing, possibly from >>>> mid gcode file. I use the drywall screw driver to do that now but need >>>> more hands, one to run the driver, one to hold the spindle still, and >>>> one to catch the tool when it comes free. By my count that's three >>>> hands. :o) Needs more thought... >>>>> >>>>> John >>>>> >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> Emc-users mailing list >>>>> Emc-users@lists.sourceforge.net >>>>> https://lists.sourceforge.net/lists/listinfo/emc-users >>>>> . >>>> >>>> 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, 1940) >>>> If we desire respect for the law, we must first make the law >> respectable. >>>> - Louis D. Brandeis >>>> Genes Web page <http://geneslinuxbox.net:6309/> >>>> >>>> >>>> >>>> _______________________________________________ >>>> Emc-users mailing list >>>> Emc-users@lists.sourceforge.net >>>> https://lists.sourceforge.net/lists/listinfo/emc-users >>>> >>> >>> >>> -- >>> Addressee is the intended audience. >>> If you are not the addressee then my consent is not given for you to read >>> this email furthermore it is my wish you would close this without saving >> or >>> reading, and cease and desist from saving or opening my private >>> correspondence. >>> Thank you for honoring my wish. >>> >>> _______________________________________________ >>> Emc-users mailing list >>> Emc-users@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/emc-users >> >> >> >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > > > -- > Addressee is the intended audience. > If you are not the addressee then my consent is not given for you to read > this email furthermore it is my wish you would close this without saving or > reading, and cease and desist from saving or opening my private > correspondence. > Thank you for honoring my wish. > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
