Reply with QuoteI've had the same thing happen pretty frequently. I've no idea why, but it hasn't been enough of a problem for me to pursue.
Mike
Spindle Braking Not Working
The Tormach is setup with dynamic braking to stop
the spindle.
When this occurs you can hear the motor “wine” as
VFD applies the brake.
My machine has gotten to the point to where it applies
the brake when it feels like it!
I was machining 30 parts that required 4 tool changes
and some times it would apply the brake and some times it wouldn’t.
I contacted Tormach about this and they said I’m not the only one with this problem and they told me there not sure what causes this.
Has any one else noticed this?
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I've had the same thing happen pretty frequently. I've no idea why, but it hasn't been enough of a problem for me to pursue.
Mike
I opened the door on the cabinet where all the electronics are and set the spindle control to manual
and cycled the spindle on and off about 20 times and
found that when the braking is applied just before it stops I could hear a relay “click”.
On my machine there is a board to the left of the VFD with three light blue relays mounted at the top, one of them is activated when the braking is applied.
When I cycle the spindle and the braking is not applied I don’t hear this relay.
I can place my fingers on the relays and feel one of them
apply when the brake is applied.
I hope this helps
Chris
No, it's not! Prove that it is!Originally Posted by TT350
At least, mine doesn't behave as if it had braking.
Keep hands and feet outside the ride until it has come to a complete stop.
I have learned to live with the coastdown...
Best regards,
Randy
Well I can say this much, there are times that the spindleNo, it's not! Prove that it is!
At least, mine doesn't behave as if it had braking.
Keep hands and feet outside the ride until it has come to a complete stop.
I have learned to live with the coastdown...
Best regards,
Randy
will come to a “controlled stop” and there are times where it just coasts to a stop.
What ever you want to call “it”, “it” don’t work half the time and Tormach doesn’t know what to do about “it”.
I'm not worrying about it. In the grand scheme of things, the spindle taking 6 or 8 seconds to coast down vs 1 or 2 (?) seconds of braking doesn't make a big difference.
At least my spindle drive has been very reliable in actually turning the spindle, in contrast to some of the experiences I've read here and on the Yahoo list.
Best regards,
Randy
I'm a bit of a nit pic about things working like they should.
From an email just sent by Greg Jackson to the Yahoo Group, the "braking" is set to a 7-second stop from 4500rpm and an unbraked coastdown from the same speed would take about 10 secoinds.
So the 6 to 8 second stopping time I mentioned above is apparently the properly working braking action. I was expecting a 1-2 second deceleration, but Greg said that needs a better VFD with a regenerative braking resistor.
Best regards,
Randy
I understand what your saying but I’ve been working on
a 100 parts this week that takes 4 different tools.
I mount a part in the vice and run the program and
change tools 4 times for each part.
T1 4500 RPM
T2 4500 RPM
T3 1750 RPM
T4 4500 RPM
When the machine applies the brake it will bring the
spindle to a complete controlled stop.
When it applies the brake you can hear the motor wine
and this is present until the spindle stops turning.
The brake works when it want’s to, some times it will
work 5 or 6 times in a row and it may not work for
5 or 6 times in a row, and other times it may work
1 or 2 time and not work 1 or 2 times.
I put a pad on my bench and started keeping record
of this looking for a pattern, there on pattern, it’s random, hit or miss .
I have had the exact same problem. This seems completely random. As I complained to Tormach, and in a nutshell (and many more words) Greg Jackson basically responded to me : you get what you pay for.
There could be a solution though. Here is Greg's email conclusion:
"We have had at least one customer retrofit the machine themselves with a regen capable spindle drive. It was part of a conversion they did to make the machine suitable for untrained operators in a dedicated production environment. I think the drive replacement would be about $350 or so."
I'm going to put a manual brake on my machine
like the one that’s on my knee mill.
Then it will stop when I wont it to stop.
gabe,
Have you seen message #2563 on the Yahoo Tormach group? In that Greg discusses the issues and a possible fix a bit.
Mike
