- Kira VTC 30
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Last edited by m1n1m; 10-12-2017 at 06:32 PM.
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Re: Kira VTC 30
Looks like a cool machine for your shop. I had similar fears when I purchased an old 1986 J310... Honestly was not sure if I'd purchased 4,000lbs of scrap or a decent mill... I had sold my beloved Bridgeport and jumped into the deep end of CNC with zero experience. Really happy to have made the transition now and could not imagine going back to a manual mill. I don't know a thing about your machine but I can offer encouragement and moral support... I had to swap out the control on my machine, keeping the servos and amps so perhaps I can be of help if that's a direction you end op going. Good luck!
Mike
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Re: Kira VTC 30
Nice! I’ve considered replacing the control system if that’s the reason for the spindle not working. Also if I can’t drip feed the program this control system won’t work due to memory limits. I might take you up on this if I ever come this far in the project. Did you rebuild into mach3 you kept the encoders?
The cable dimensions are now clear. Due to low ik2pmin I have to use a 3x50mm2 cable from my house to the garage to meet short circuit requirement. This was crazy expensive and I’m not even sure if I will be able to pull it out to the garage. Going to do a test pull this weekend before I order the cable. I put new asphalt over the cable only one year ago so I’m really hesitant to dig up the road again to put down a new one. Without this new cable I don’t think I can even power it up to test it There is a huge voltage drop in the current cable if I put some load on it. drops from 240 to 200.. I guess I will only ruin electronics if I test on voltage as low as this and when I power up the machine the 9kva trans will act almost like a short and pull it even further down until it powers up. What do you guys think?
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Re: Kira VTC 30
Electronics, servo amps and servo motors will likely all be useable with your current 25amp 3phase service. You may have issues if your taking a big cut at 40ipm... Not sure why your seeing so mush voltage drop? Is it a long run? Perhaps the service wire gauge is undersized?
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Re: Kira VTC 30
Good work so far! Impressed by your determination to build a proper home for your new mill. Wish I could give you a perfect answer as to the risk associated with running the control and servos with your limited electrical service... I'd guess it's unlikely you'll destroy anything. When you start the machine you're running the computer/CNC control and the display only. I'd guess you have sufficient power for that. If you enable servos you then need a fair bit or power as the amps start. Next, if you move an axis your asking for yet more power to supply a servo with power to move the table. Finally there is the spindle, lot's of power needed for that... You can take it in steps...
Regarding door position switch: My J310 won't enable the servos until all the interlocks are closed. These are: Two NC cabinet switches, three NC axis limit switches (X,Y,Z). If you can get servos enabled you'll hear a BIG relay go "Ker-Chunk" and you may hear some 15khz whine from the amp. If you can get servos enabled you can try some slow axis moves and see how things run... As for the spindle, I'd wait until you have your new service installed before you fire that up...
Lastly, this came into my inbox today. Pretty much sums up my early days of CNC...
https://www.cnccookbook.com/10-thing...sletter+Oct+25
Mike
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Re: Kira VTC 30
Keep up the great posts with all of the detailed photos. I have been watching your progress for a couple of weeks now, and am happy you were able to bring the beast back to life.
I only have a Novakon Torus CNC mill, which is a toy next to your mill. Maybe some day I will be able to move up to a real CNC mill.
I’m looking forward to more posts as you restore your mill and start machining parts.
- Kira VTC 30
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