Thread: Kress ATC
Ive Looked and looked for an ATC for My currect build and nothing seems to jump out at me, and then i noticed this Kress ATC...http://www.marchantdice.com/forumimages/kress-atc.pdf, i did have a look in the posts but couldnt see any real discussion about it, has anyone any Knowlege????
RickAlways bear in mind that your own resolution to succeed is more important than any other - Abe Lincoln
If you like that design for the Kress then I would strongly suggest looking at Sorotec and their online shop as they have the same tool changer (and have had for longer then Marchantdice, at a savings minus shipping differences of £70 in price over Marchant Dice. It is the exact same unit and they have them for the full range of Kress from what I see. Best of luck and hope this helps.
21-09-2012 #3Always bear in mind that your own resolution to succeed is more important than any other - Abe Lincoln
I suspect it's got a lot to do with holding force, balance and liability.
Reading the bit in that manual about bearing/seal replacement, states that if the seals have failed that bad that the holder won't release, then you can pull them out by pulling with 220N of force on the holder. With so little force, I doubt they're using a self locking taper (it takes a lot more than that to release even a MT1 taper!), which means they must be relying on friction to transmit drive. Even an INT/BT/CAT taper takes a good bit of force to knock out.
Also with so little holding force, it won't be able to withstand much force before the holder starts to get pulled out when in use, which is probably why that style doesn't exist for larger spindles.
I would like to see one of the ATCs dismantled, to see how the pull stud mechanism works, and how they've sprung it.
Although having seen a close-up of the tool holders pull stud, it's given me an idea on something that may work in a compact format while still providing a high pull out force...
I won't be building any soon. Got far too many other things to do, but a few doodles would indicate all the bits would fit in, however it would need a good few calculations to see what kind of forces would be involved and if they're acheivable.
Thinking outside the box a bit, use a set of ball bearings that go under a pull stud, that are then forced into place by a spring loaded outer tapered sleeve. The spring could even be assisted in locking by air pressure, as once the tapered sleeve is pulled up, using appropriate tapers it's essentially self locking.
Now for release, you have another set of bearings on top, that also run against a taper, but this taper when moved to release, forces the bearings between the top of the pullstud and another taper above the pull stud.
It would be quite a complex setup, needing hardening and grinding of various parts, and that's once you've figured out how to machine all the various bits to ensure the balls don't just drop out.
This discussion is getting dangerously close to this design:
I made a prototype of that just to test the mechanism, but a bit bigger. It holds the holder reasonably well, but since it was only a test I used a random grade of steel which didn't harden much and I didn't grind it. I think it could work, but I doubt the holding force and torque transmission would be that great.
I bought some EN19 steel to have a go at making a proper one...
22-09-2012 #8Always bear in mind that your own resolution to succeed is more important than any other - Abe Lincoln
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