Combi Mill Pro 3000 conversion

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09 Sep 2012 19:36 #24099 by RatAston
I have a Combi Mill Pro 3000 vertical mill that I am planning on converting to CNC, the mill used to have cnc control, so has ball screws but has been converted to manual.
I also have five SEM MT30F 4-45 DC servo motors and mountings from a bridgeport conversion (I think it was an Anilam conversion). The mountings should fit the Combi Mill as it is a bridgeport clone, but a bit bigger with a 54" x 10" table and ISO30 taper to the spindle.

I would like to use these motors if I can.

Looking through the posts on this and other forums it looks like I can use a Messa 5i23 with two 7i29's

Is this the best option? and what do I need to do about encoder/tacho/resolvers? The motors state Tacho 9.5V/1000rpm on the data plate.

Also any suggestions on power supplies for the motors?

I am new to the world of CNC but I have some background knowledge of electronics. I am based in the UK.

Thanks in advance for any sugestions.

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09 Sep 2012 20:20 #24104 by andypugh
RatAston wrote:

Looking through the posts on this and other forums it looks like I can use a Messa 5i23 with two 7i29's

Pico might also be worth a look: www.pico-systems.com/motion.html

what do I need to do about encoder/tacho/resolvers? The motors state Tacho 9.5V/1000rpm on the data plate.

Anilam tended to use tachos on the motors and linear scales on the slides. Getting tacho feedback into the digital domain is slightly troublesome.
I think you would probably want to swap the tachos for encoders, though there are other options.

Also any suggestions on power supplies for the motors?

At 165V I think that the 7i29 looks to be intended for simple rectified US mains. A building-site 110V transformer, a beefy rectifier and some big, low-ESR caps might be one solution.

I am based in the UK..

There are quite a lot of us who are. Welcome aboard.

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10 Sep 2012 00:16 #24108 by BigJohnT
I'm converting an Anilam 1100m atm on a BP knee mill the power supply for the drives is somewhat simple with a bridge rectifier and a rather large cap. Do you still have the Anilam drives?

John

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10 Sep 2012 16:41 #24127 by RatAston
Thanks for the replies.

I thought that encoders would be the way to go, do you have any suggestions on sources and type?
I like the idea of the builders transformer, but my motors are 140V, I cannot remember my transformer theory will the voltage be too high?

I have looked on both messa and pico websites but I think I still need to learn a bit more before I take the plunge.

I do not have any parts of the system apart from the motors and mounts.

Thanks

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10 Sep 2012 17:19 #24129 by andypugh
RatAston wrote:

I thought that encoders would be the way to go, do you have any suggestions on sources and type?

Not really, though I have heard that there is an unfortunate lag in the AMT CUI ones.
thread.gmane.org/gmane.linux.distributio...er/31229/focus=31233

I like the idea of the builders transformer, but my motors are 140V, I cannot remember my transformer theory will the voltage be too high?

110 * sqrt2 I think, so 155V. I would be surprised if 140V motor insulation couldn't handle 155V, especially as the _actual_ voltage is likely to be less once pwm and inductance are considered.

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10 Sep 2012 17:30 #24130 by BigJohnT
RatAston wrote:

I do not have any parts of the system apart from the motors and mounts.


Mine are DC servos and you can tell by the 4 brush covers around the motor about in the middle. If you take the end off do you see an encoder? If so below that should be a tach generator. AFAIK DC servo drives are common H bridge type like a 7i29 but let someone else confirm that. My Anilam 1100M drives are 120vac into the power supply and about 90 some odd volts to the drives...

John

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12 Sep 2012 18:57 #24207 by RatAston
I have looked at my motors, the connections they have are:-
A1 & A2 - Motor
T1 & T2 - Tacho
K1 & K2 - Thermal Overload

so they do not have any encoders.

I have had a surf on Ebay and there seems to be quite a selection of rotary encoders on there e.g.

www.ebay.co.uk/itm/Xinya-Increament-Rota...&hash=item4167d3adee

or

www.ebay.co.uk/itm/T1-Line-Seiki-Rotary-...&hash=item35ad812c64

are these the type of thing I need and what sort of resolution will I need.

Thanks

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12 Sep 2012 21:24 #24208 by andypugh
RatAston wrote:

www.ebay.co.uk/itm/T1-Line-Seiki-Rotary-...&hash=item35ad812c64

are these the type of thing I need and what sort of resolution will I need.


For motor mounting you may want the through-hole style such as www.zappautomation.co.uk/hkt300635301g10...-p-217.html?cPath=17

You want as many counts as possible, without overloading the counters. If you are using Mesa cards then anything up to 256,000 cpr seems OK, but with a parallel port you might want to stay around 1000 cpr, possibly lower.

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