whats the matter!

[Tom]

relies on "Is the motor in the box the same one the spec sheet is for ? "

I agree - this can be a bit of a lottery. Sales literature sometimes gets pegged to a P/N for a good while longer than the engineer who wrote the data would be happy with. Hopefully though it means you get something better than on the spec sheet, rather than worse. (hopefully).

a simple way to measure torque is to use two indexing discs (opto or magnetic pick-up) separated by a torsion spring (a thin rod or shaft). By measuring the timing difference between the indexes one can calculate the angular displacement thus the torque (the torsion rod can be calibrated statically with a simple arm and weight).

Bill that's a much more robust way of doing things. The index disc on the stepper side could also be used to check for missing steps before the stall. It's probably even possible to use a couple of parallel port inputs to feed into the halscope in EMC2 to take the readings...
Hmm I can feel a project coming on before I build machine number2!

[Robin Hewitt]

a simple way to measure torque is to use two indexing discs (opto or magnetic pick-up) separated by a torsion spring (a thin rod or shaft).

Do we really need brake horse power? Couldn't you just wrap a bit of string round the pulley, tie it to a spring then see how far it gets before it stalls?

You could then calibrate the spring by tying it to a horse :naughty:

[Gary]

The 2M2280n is a new driver that replaced the leadshine driver that everyone is familiar with (M2280) The M2280 stated 220V but in reality if you supplied it with 220V AC over a long period of time the driver would fail.
the new 2m2280n, is way better than the leadshine driver and is totally different, with a lot of new features that until recently you would only find of very expensive drivers.

It still only rectified the AC, so will not work with smaller motors, and is really only good for the largest 34 and 42 frame motors, and the downside is the heat, but if you are using good quality motors, you will be ok
When i worked at MCP we have a lot of the M2280 drivers back from customers connecting them direct online.
Even though the motors got hot, no motors were returned after failure, this is because we used quality motors.
There are a lot of motor manufactures in china and most started when a large state owned factory changed and a lot of the engineers decided to start out by themselves.
There are four manufactures in china that i would be happy working with, and the others i either have no experience of or would not touch them with a barge pole.
I have been working with Chinese motor manufactures for nearly 15 years and started off with the large state owned factory (GBM).
The problem is that a lot of so called motor manufactures are not actually manufactures and are only agents and the problems of getting the motor you ordered becomes a problem, because they shop about for better prices and motors on one order will be different on the next so that is why you need to work with a factory that is ISO 9001 and produce motors that are CE or UL.
There are not a lot of those.
If you have continuity problems with the motors you are currently buying then you are buying from an agent or a factory with no quality control, and need to change.

The ISM6045 is 5V only.

Someone asked about encoders, we have solid shaft encoders in stock, but have not had the chance to put them on our site so if you know what you need tell me and on Monday i can check stock and tell you the price.

We also have hollow shafted encoders but not as many.