Hurco BMC30/M LinuxCNC Refit

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06 Feb 2022 13:52 - 06 Feb 2022 13:55 #234103 by LinuxHurco
Hi everyone,
I would like to share my CNC build and where I am currently at with my project.
I am working on an old Hurco BMC30/M. Below is a photo of the BMC arriving at my home. 



I have now stripped the machine down to just the column and bed, I am waiting for a crane to dismantle it further.  



I now plan on splitting the column from the base and then stripping the paint and repainting the machine.
Below is an image of the old electrical cabinet, I am replacing all of the parts and am planning to make the machine a single phase machine. 

 

I hope to do an update on the build when it has progressed a bit further. 
Thanks for looking!!
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Last edit: 06 Feb 2022 13:55 by LinuxHurco.

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06 Feb 2022 18:06 #234138 by tommylight
I would try to use the existing drives, they are very good as long as they work properly, especially i would use the spindle drive, anything close in performance costs in high 4 figures. Also has spindle orient built in.
They are also very easy to tune, like 3 minutes in total.
The only bad thing is they use proprietary encoders so if changing the drives, they must also go, not easy to remove them at all.
Also do not remove the green relay/fuse board, that is the tool changer control with interlocks.
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06 Feb 2022 18:54 #234150 by LinuxHurco
Hi Tommy, Thank you for the advice but I plan on making the machine single phase and selling the components such as servopacks, motors and spindle-drive.
I hope that this plan sounds okay and will provide me with a very rigid and inexpensive machine, even if it does mean losing some of the power that the machine once had.

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06 Feb 2022 22:06 #234182 by tommylight
Yeah about that, i doubt you can make it a single phase, or to put it better, you can make it single phase if you lower the spindle power a lot and never use all 3 axis at the same time.
My 20P had 0.75KW motors and a 5.5KW spindle, and a very large transformer from 3X380V to 3X220V.
That can not be run on a single phase.
De-rating the spindle to 2KW and motors to 0.5KW might just bring it to single phase, but .....

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06 Feb 2022 22:21 #234184 by LinuxHurco
Thats the plan with downgrading the spindle motor and replacing out the servos, currently it's a 7.5 kW Yaskawa motor (which is more power than I need) I was thinking of downgrading it to a 2-3kW spindle which I can run off a VFD.
I hope that a 32 amp single phase connection will be enough for this, if not then I will have to reconsider.

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06 Feb 2022 22:48 #234190 by tommylight
Just to be sure, are you sure you can run 32A on a single phase and neutral?
We can run 16A single phase + neutral, but we can run 32A on any and all of the 3 phases without neutral.

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06 Feb 2022 23:02 #234193 by LinuxHurco
Yeah in the UK we have 32A 2P+E single phase, I currently use this socket connector for my MIG welder.
I have some sizable Nema 34 motors laying about from a previous project so hopefully I can make up an adaptor plate this week and see how fast the feed rates are and they accuracy on the X axis with the heavy table.
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