Thread: my build from the start
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21-12-2010 #1
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21-12-2010 #2
Ah, the ubiquitous TB6560 3-axis board from eBay... If you haven't already, you might want to search for TB6560 and look at other threads related to these boards...
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21-12-2010 #3
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23-12-2010 #4
well got the pc up and running and the steppers all wired up plugged in and running
no probs as yet
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23-12-2010 #5
hahahah!!! nice one chris... its ages since i was in that position watching them motors turn on the road runner g-code
it was all magical mystical shit to me (still is a bit)
iv got the 5 axis version of your board, my motors are a bit bigger than yours and dont really get hot at all on 24v, iv heard plenty of people reporting how hot the motors get, i think in some cases its pretty normal
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23-12-2010 #6
The motors make useful hand warmers this time of year :-)
Mine run on the edge of too hot to touch and I haven't had any problems yet - 80 degrees C above ambient seems a common maximum.
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23-12-2010 #7
I hope not... 85degC absolute case temp is the maximum recommended temp you should run a stepper at - higher than that and you risk internal breakdown and demagnetisation.... remember inside its going to be a lot hotter!
an 85degC case is too hot to touch for most people. Maplin do a cheap £19 multimeter with a temp probe thats a useful bit of kit for playing with electrics...
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24-12-2010 #8
Sorry, yes - 130 degrees max internal which is about 85 degrees on the case. This website seems to think 70-80 degrees is normal - bit of a useless temperature that - hot enough to want to avoid touching but not hot enough to make tea.
80 degrees above ambient is pretty tepid in my garage at the moment so I don't think it will be a problem for a while :-)
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26-12-2010 #9
Hot enough if you're 6700m above sea level!
My motors (3nm size 23, 4.2A on 75v) rarely got hot. The vast majority of the time I can barely feel any temperature rise. It's only when the machine has been running for a long time that they start to get hot. I think the drivers reducing the current to 50% when stationary helps here.
It makes me wonder if I can up the current a bit and get a bit more torque/speed. It's on 4.09A, could try 4.64A. That'd be up to 30% more heat I think (I^2*R), or 20% above rated power.Last edited by Jonathan; 26-12-2010 at 01:09 PM.
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23-12-2010 #10
What motors are those Chris?
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