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Offline Hood

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Re: mill retro HELP
« Reply #10 on: May 29, 2008, 03:34:12 AM »
No experience with EMC, did look at it when I was starting out with my first retrofit but it seemed too daunting for a beginner and the features were nothing like Mach had at the time, also I would have had to learn Linux.  Mach has moved on a long long way since then so I  have no doubt that EMC has as well.

Hood
Re: mill retro HELP
« Reply #11 on: June 02, 2008, 11:55:58 PM »
Still haven't heard from teknex, so I'll order 3 gecko 340 and a pmx122 board. Whats the biggest machine you have running on mach 3?
Ed VanEss

Offline Hood

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Re: mill retro HELP
« Reply #12 on: June 03, 2008, 02:19:50 AM »
Strange, I know I havent contacted Teknix for a long time but they were always very good with the support in the past :(

 I have a 3tonne (6600lb) Lathe running on Mach, it has a swing of 520mm over the beds, 290mm over the saddle, spindle bore of 75mm  with a length between centres of 1000mm. Its load capacity is 290mm DIa and 500Kg (1100lb) between centres and 520mm dia 250Kg (550lbs) in chuck alone.
 I also have a Bridgeport CNC mill which weighs in about 1.5Tonne (3300lb) and I am in the middle of doing another mill, a Beaver which is over 2Tonne(4400lb)
 

Hood

Offline da21

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Re: mill retro HELP
« Reply #13 on: June 03, 2008, 03:20:49 AM »
if your servo drives are fine then use a controller capable of analogue output ( + - 10v dc),
to drive the origional Baldor servo boards or alternatively you could also easily take a pwm step directon output and convert it to analogue


or concider looking at a Pixie http://www.skyko.com/products/ ( although they now note the have been witdrawn as a product
you may still catch a few from stock etc )
or http://www.Dynomotion.com kmotion controller which gives you the benifit of USB 

Dave
Re: mill retro HELP
« Reply #14 on: June 05, 2008, 10:54:37 AM »
Hello Ed
 Just reading through your post i have a retrofitted a lagun mill with Geckos the motor's are servo type 120 volt i am running the geckos at a reduced voltage right now which is 55 Volts the motor's and the mill work just fine my plan for the future is to change out the power supply to 75-80 volt unit don't know that the mill realy needs it though good luck with your project.

Dennis
Re: mill retro HELP
« Reply #15 on: June 06, 2008, 02:10:13 AM »
Hood, I did hear from teknix- They were gone to a trade show, but they are working on a converter. They will get back to me in a week.
But I did order 3 gecko 340 drives and a pmdx 122 board.

OK- If the Gecko 340 is rated for 80 volts dc, and my transformer is putting out 100v dc, must I drop it to 80v , and how?
Thanks again .
Ed VanEss
Ed VanEss

Offline Hood

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Re: mill retro HELP
« Reply #16 on: June 06, 2008, 02:26:27 AM »
Yes you have to drop the voltage, 80V is a max for the Geckos, going over that will risk blowing the drives. There may be other tappings on your transformer so that you can select lower output voltages or there may even be tappings on the Input side for higher voltages than you are using, either may drop the output. If your transformer cant be tapped for lower output then you would need to get another transformer to drop its output down to a voltage you required, this however would be a waste of time as you would now have two transformers to do one transformers job, so you would be as well taking out the original one and replacing it with a new one. You have to remember also that the AC voltage output of the transformer will have to be a lot lower than the voltage you require, once rectified and smoothed the DC voltage will be 1.4 times (approx) greater than the AC transformer output.
Hood
Re: mill retro HELP
« Reply #17 on: June 06, 2008, 01:16:22 PM »
Thanks Hood,
   So I need a transformer that puts out between 50-55 volts ac . before the capacitor. Correct?
Thanks again.

Ed V
Ed VanEss

Offline Hood

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Re: mill retro HELP
« Reply #18 on: June 06, 2008, 01:21:33 PM »
Yes thats correct.
  Toroidal transformers are nice and fairly cheap . Good thing about toroidals are you can add or remove a few turns to get the voltage you require if its not quite right, also they tend to put out a lot less noise than a traditional type transformer and usually take up less room.
Hood
Re: mill retro HELP
« Reply #19 on: June 06, 2008, 07:29:01 PM »
Will this work?    I have a 220 v to 70 v  transformer. If I put in 120v -I get 38.9v out x 1.4 would give me approx 54v dc.  On a previous post, Dennis is running on 55 v.
I also checked a nother 220 v trans with 120V  in I get 61.4 v out x 1,4 would be approx 85.9v dc = to much. How does this sound? [ didn't get my hearing checked yet} :D
Thanks again.  My other machine is running 150 v servos on 113 v dc and works fine.
Ed V.
Ed VanEss