However its a good idea to program ramp time of 6 sec in the Vfd and 10 sec dwell time in Mach3
Last edited by Boyan Silyavski; 07-09-2013 at 12:04 PM.
for what it's worth, this seems to be the spindle I have...
800W High Speed CNC Spindle Motor, View spindle motor, JST Product Details from Changzhou Jiesite Electrical Co., Ltd. on Alibaba.com
(the model is jgd-65c-800 - it has 400Hz stamped on the case)
Last edited by HankMcSpank; 07-09-2013 at 12:31 PM.
The braking resistor is mostly for when a motor is connected to a load, for example imagine a motor connected to a 10ton flywheel and somebody hits the emergency stop button. There's a lot of energy to get rid of in a short space of time and it's the resistor that dissipates this energy, obviously a spindle in our application does not have a load connected.
Also re. ramp times, in the ABB I use on my pin router I have the normal ramp time set to something over 5 seconds (can't quite remember) but I can set another ramp for emergency stop situations and this is set lower and for this I use a braking resistor (because I already had one) which allows it to stop very quickly but in reality it's not doing a lot. Also the resistor is there to prevent damage to the drive, depending on how much protection is built into it the DC link voltage can rise and cause damage.
In my first post when I talked about getting the higher quality version of the 800W spindle to reduce noise (among other things), I didn't realise that you already had a spindle. I've made the video comparing the two spindles I have to hand:
Again, the video makes it sound worse - in reality the 3kW spindle is so quiet that you could almost forget that it's switched on.
Last edited by Jonathan; 08-09-2013 at 05:28 PM.
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Thanks Jonathan...quite a difference - even with the 3kw spindle lying on a large flat table (which will possibly 'amplify' the spindle's sound/vibrations ....just like a soundbox on an acoustic guitar).
The smaller spindle sounds quite loud to my ears...but again, that might be a trick of the camera mic.
(btw your audio in that youtube video drops out completely at approx 4m16s)
Last edited by HankMcSpank; 08-09-2013 at 08:45 PM.
Last edited by HankMcSpank; 08-09-2013 at 09:21 PM.
So, something arrived in the post today, from Italy ...
About £120 delivered (thanks for the heads up silyavski).
Sure, I can buy cheaper if I go the Chinese path, but I've had some horrific experiences with chinese electronics over the past couple of years (TB6560 anyone?), so I decided to pony up the extra forty quid which will hopefully save me some grief!
Last edited by HankMcSpank; 09-10-2013 at 03:22 PM.
A bit more heads up:
The Speed and corresponding frequencies in HZ, measured carefully with a device, you r can be slightly different but not so much. Open it in new window to see it better and enlarge it with "control" + "+" , or PM if you can not read it:
The typical connection / check well the manual/
cables from left to right
- trip ,
- PWM control,
- ??? i forgot , not so sure, but it was enable to the BOB, in case of power loss it stops everything/
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