Nema 34HST9805-37 and DM860A Driver
Really hoping some1 could explain this and give a possible solution other then replacing motors. I get a bad vibration in motor between 70-75ipm any speed below or above the motor runs very very smooth.
I'm using these motors and drivers with the CNCRP R&P system. They seemed to work very well, I was able to get 1100 ipm before stalling, I have it set at 800ipm with acceleration set to 80. When jogging 100% the motors run very smooth.
I noticed this problem after installing a hand controller and doing some air cuts when the motor is more likely to run at this speed (70-75ipm). I tried different motor and driver(same models though) and microstepping settings with basically the same results.
Any help will be really appreciated,
Dan
Re: Nema 34HST9805-37 and DM860A Driver
Hello,
I know this is an old topic, but I just came up to the same problem.
Have Nema 34 870 oz steppers and I am getting massive vibrations on 15 mm/sec. Cutting aluminium with microstepping from 1600 to 12800 makes no reasonable difference.
Drivers are DM860A and all came in a package from longs motors from China. I have not room for adding motor dampers, but I want high precision machine.
I was pretty fresh and I was going for "bigger is better" and came with this kit.
Was thinking changing drivers, or changing motors, and get some 1:5 reduction.
I was working on my Rack and Pinion solution for almost a month, thinking that was the problem.
Any suggestion what to do?
Going for Gecko drivers or going for smaller motors?
Thanks,
Marko
Re: Nema 34HST9805-37 and DM860A Driver
Hi Marko,
I purchased the same kit you did and experienced the same problem. My kit came with 2-250watt 24V PSU and often wondered if a higher voltage PSU would of helped. Don't know never tried. With some searching I read most resort to Gecko drivers. I purchased new 34nema steppers and PSU and my problem went away using the drivers and BOB that came with kit. The LongMotors steppers are still in there box they were delivered in.
Dan
Re: Nema 34HST9805-37 and DM860A Driver
Hi Dan,
I sort of solved issue. Ive put some smaller pinions and by that, increased the rotary speed. Will also go on reduction 1:5 to increase mechanical resolution 5 times.
I have a 1x48 Volts power supply, and I think motors are pretty ok. When you have the time, you can test them, and get back here.
I think I will sell my machine and make one for harder metals. Do you have any link or videos of your machine? I am very interested in Gecko drivers and motors.
Thank you.
Marko
Re: Nema 34HST9805-37 and DM860A Driver
Not sure if this thread is too old, but I am looking to CNC my Sieg SX3 mill - and have looked at various suppliers, and also saw this eBay offering from Long's Motors -
ã€Year-end Promotions】4axis nema34 stepper motor 878oz.in single shaft CNC Kit | eBay
which seemed good value for money - but I have seen some very negative comments and am now not quite so enthusiastic, but did wonder if perhaps it was worth buying just the motors and sourcing the drivers/power supply from elsewhere? The drivers are DM860A - not very good? Motors are 34HST9805-37B2?
I need Nema 34 7Nm (or 900oz/in) motors but am open about the rest of the setup but is seems like a bit of a minefield!
I can find suppliers who can find me all the components but with less powerful motors - 4Nm (or 500 oz/in) but want over 1,000 UKP for the similar setup
Thank in advance
Chris
Re: Nema 34HST9805-37 and DM860A Driver
On the power supply, you might try a stack of 12 volt batteries with a "mobility cart" charger that matches the stacked voltage. 36 volt chargers are common. I've seen 48 volt. Be sure to fuse well and often. And keep in a box to avoid acid, etc... in case of leaks. But you can't beat the current!
As to drivers, Gecko's are unbeatable. But if you want to save some money, you might try my THB6064AH kit. It's comparable for half the cost... and because you build it, you can fix it if you fry it (not likely, but anything can happen). The replacement chips are only $10.
Re: Nema 34HST9805-37 and DM860A Driver
Lopata,
What is the current rating of the motor and what current is the drive set for. ?
Sometime people set the peak current instead of the RMS on the drive. The lower current setting may give you smoother motion.
You are better running a lower current and a higher PS voltage, as you will get better high speed performance.
Also is that a single or dual stack motor size 34 motor ?
Re: Nema 34HST9805-37 and DM860A Driver
Thank you James - I have sent you an email message from the address on your website?
(Basically asking if your stepper driver would work with these motors, as far as current and voltage is concerned)
Regards
Chris
Re: Nema 34HST9805-37 and DM860A Driver
Thank you James, I have sent you an email from the address on your website - basically asking if your driver would be able to work with these motors
Chris
(apologies for double post, there is an error on the forum when you reply and I wasn't sure if the reply got sent!)