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Messages - bw

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11
General Mach Discussion / Re: Anyone using the Ajax control system
« on: December 12, 2011, 05:00:52 PM »
Not sure what motors you have but I do know you don't need the tach or the brake.  I would wait until you get your power supply before testing any further.  Also if you wired up your encoder cables yourself double check them, I crossed one wire when I did mine and got errors.

12
General Mach Discussion / Re: Anyone using the Ajax control system
« on: December 11, 2011, 06:34:09 PM »
You need to change it from 1 to 0 on the encoder to disable it.  If you are unable to do so, something else may be wrong.  Aslo turn your encoder by hand and see if it gives you the same fault.

13
General Mach Discussion / Re: Anyone using the Ajax control system
« on: December 11, 2011, 11:59:22 AM »
Check in the Ajax config.  Both high and low spindle bits should be set to 0-auto detect.  Also in config you can change the "stop encoder error" from 1 to 0 to let the machine run with the error while you get it dialed in, just be careful they don't run away on you and don't forget to change it back when your done.

14
General Mach Discussion / Ajax&tool height setter
« on: November 30, 2011, 02:42:50 PM »
I am running the Ajax setup with the DC3IOB&MPU11, while I am in the cabinet hooking up the VFD I would also like to add in a simple tool setter with PCB board.  The MPU11 has a probe input but I am really unsure if that is what I should be using or another input.  The Ajax instructions say nothing about a tool height setter just the probe and I am lost when it comes to all these port&pin configurations, I read Tweakie’s page on it and it was helpful and know I am ground to the chassis in 2 of the probe pins but just not clear on what is what, where I should enter pin numbers or who knows what else I am missing.  I have searched on the Ajax forum with no luck.  Any help would be great.
Thanks

15
General Mach Discussion / Re: VFD and vari speed pulleys
« on: November 27, 2011, 09:42:35 AM »
Thanks,
From what I have been reading I figured the sensorless vector drive was the best choice, just wanted to be sure.

16
General Mach Discussion / Re: VFD and vari speed pulleys
« on: November 26, 2011, 08:06:26 AM »
I think I figured out what I would like to do but would like to run it buy here to see if I am missing something.

If  I go with a 6.75 pulley on the motor and 3.75 on the spindle, it will give me a 1:8 ratio with 3150 rpm at 60Hz and about 375 rpm in back gear.


At 120Hz I will have 6300 rpm
At the low end 10Hz, 525 rpm and 60 rpm in back gear.

Those numbers work or me as long as I am not missing something, also I can get a GS2 VFD from a friend who is no longer using it but it is not a sensorless vector unit and I am not sure if I should use it or just get a VFD that is sensorless vector.

Thoughts?

Thanks

17
General Mach Discussion / Re: VFD and vari speed pulleys
« on: November 23, 2011, 01:12:28 PM »
I will look and see if I can tell what bearings are in there when I get it apart to see what they are rated for.  I have replaced the bearings in the j head before so I know it's not that big of a deal, I have a set of good j head bearings on the shelf, if they are the same as in the supermax I may just swap them while I have it apart.

18
General Mach Discussion / Re: VFD and vari speed pulleys
« on: November 23, 2011, 12:26:40 PM »
Ray, that is just what I was looking for.  I figure I am going to keep the back gear so low speeds shouldn’t be an issue and I of course would like the most rpm I can get on the top end without burning up the bearings. 

Thanks!

19
General Mach Discussion / Re: VFD and vari speed pulleys
« on: November 23, 2011, 10:26:26 AM »
I like the idea of the v belts over timing as one of the things I hope to get out of doing this is to silence the beast.  My step pulley Bridgeport runs smooth and quite and I am hoping for the same on this when I’m done.

What I am having trouble wrapping my head around is the motor is 1725 rpm’s, and max rpm of vari speed is 4000 rpm, what diameter pulleys will I need to get that same ratio?  I know there must be some equation to figure it all out but I don’t know what it is.

Thanks


20
General Mach Discussion / VFD and vari speed pulleys
« on: November 22, 2011, 07:25:16 PM »
I am getting ready to install a VFD on my old supermax vari speed mill running Mach and would like a little advice and or suggestions about getting rid of the vari speed drive and going with direct pulleys.  The motor is a good 3 hp 3 phase and I have read I can get more RPM’s out of it with the VFD, 99.9% of my machining is aluminum so besides the occasional tapping head low speeds are not that much of an issue

What I don’t know is what kind of ratio as in 1 to 1 and what diameters I should be looking at for the pulleys, also a good source to get the pulleys.  I figure there has to be a few others out here who have done this and wouldn’t mind sharing the good, the bad and the ugly about doing it.

I am sure I will have a few more questions when I get to installing the VFD but I would like to do the whole job at once so any help will be appreciated.

Thanks.

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