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Author Topic: Time to show off my ATC  (Read 16125 times)

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Offline derek

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Re: Time to show off my ATC
« Reply #10 on: December 28, 2012, 12:57:19 PM »
Quote
Looks looks a great thing.  Did you have to regrind the spindle to fit the bt30 gripper in?

Thanks.
no there was enough room after grinding the taper for the gripper to fit.
Re: Time to show off my ATC
« Reply #11 on: December 28, 2012, 05:28:11 PM »
The reason I ask is I have a bp clone with a nt30 and would love a tool changer but didn't think I had enough room for a gripper without modding the spindle.

Also how did you get your mill to 6000rpm. Did you use an inverter and turn up the hertz?
Re: Time to show off my ATC
« Reply #12 on: December 28, 2012, 05:51:58 PM »
The reason I ask is I have a bp clone with a nt30 and would love a tool changer but didn't think I had enough room for a gripper without modding the spindle.

Also how did you get your mill to 6000rpm. Did you use an inverter and turn up the hertz?

I run my knee mill up to 8200 RPM.  It's a 2-/4-pole AC motor, and I run it up to 90Hz in 2-pole mode, and 160Hz in 4-pole mode.  Been running that way for years with no problems at all.

Regards,
Ray L.
Regards,
Ray L.

Offline BR549

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Re: Time to show off my ATC
« Reply #13 on: December 28, 2012, 05:58:16 PM »
IF you have a QC30 or nt30 spindle and switch to bt30 tool holders the tool holder will be shorter and should give you plenty of room up top for a gripper. Just make sure if it is a QC30 spindle that the center hole is present in the spindle shaft not all QC30s have the center hole

Just a thought. (;-) TP

Offline derek

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Re: Time to show off my ATC
« Reply #14 on: December 28, 2012, 08:00:19 PM »
The reason I ask is I have a bp clone with a nt30 and would love a tool changer but didn't think I had enough room for a gripper without modding the spindle.

Also how did you get your mill to 6000rpm. Did you use an inverter and turn up the hertz?

I have a 2 pole motor that's rated at 3450 so I overdrive it a bit. In hind sight I wish I had bought a 4 pole and drove it a 120 or more hz to get the rpm. The 2 pole motor made indexing tricky and it has no guts in low rpm situations.

If you don't have a drawbar hole in your spindle then your dead in the water. If you do then I would measure the bore of the area above the taper, Check it for run out, and then measure the distance from the base of the bore to the face of the spindle nose (not the dogs). If you give me those figures I can quickly tell you if there is room.
I'd like to know myself. My neighbor has that spindle but without the drawbar hole and there didn't seem to be enough room above it to hold much.
Re: Time to show off my ATC
« Reply #15 on: December 29, 2012, 04:46:34 AM »
Looks like 14.2mm then opens up to 17.5mm to accept the shank of the nt30 (17.00mm)

Are you guys running those sort of revs with the vari speed heads or pullies?  I have turned up my inverter 10hertz above standard and to be honest thd vari head doesn't sound like it enjoys it to much so turned if back down.

« Last Edit: December 29, 2012, 04:48:30 AM by DeanoM »
Re: Time to show off my ATC
« Reply #16 on: December 29, 2012, 05:04:56 AM »
Hi!

Really good worked, look really nice! I´m building my own ATC and BT30 gripper system right now so input for you would be great.

Regarding the drawbar and gripper, did you make it yourself and do you have picture of it? What ballsize do you use?
I have build a 6x5mm ball gripper but I get dents on the pullstud (using 45deg) and don´t know if this is normal since it could affect runout I assume.
I´m using about 800pounds of force from bellevilles springs.

I also have a VFD with 2 pole 3-phase engine and planing to use index signal to orient the BT30 holder. Can you provide more detail about the shot pin, picture of it would be super?

BR/Andreas
« Last Edit: December 29, 2012, 05:08:11 AM by AndreasT »
Re: Time to show off my ATC
« Reply #17 on: December 29, 2012, 11:36:50 AM »
Looks like 14.2mm then opens up to 17.5mm to accept the shank of the nt30 (17.00mm)

Are you guys running those sort of revs with the vari speed heads or pullies?  I have turned up my inverter 10hertz above standard and to be honest thd vari head doesn't sound like it enjoys it to much so turned if back down.



No, mine is a step-pulley.  I think you'd be pushing your luck running a VariSpeed that fast.

Regards,
Ray L.
Regards,
Ray L.

Offline BR549

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Re: Time to show off my ATC
« Reply #18 on: December 29, 2012, 12:42:33 PM »
Sounds like its time to put a bushing kit in the varispeed.

(;-)TP

Offline derek

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Re: Time to show off my ATC
« Reply #19 on: December 29, 2012, 01:30:52 PM »
I've had a few requests for the M6 Macro.