Re: [Emc-users] Protection from back EMF?

On Thursday 14 June 2018 19:40:49 Chris Albertson wrote: > This is a general motion controller question > > A couple days ago I blew up a pair of mosfets What I think happened > was I had a motor going forward then switched to reverse. Basically > slammed over. The motor likely developed

Re: [Emc-users] Protection from back EMF?

Hi Chris, although I haven't had a chance to test it in 'anger' so to speak I have a voltage clamp circuit across the power supply. Mine uses a small PIC micro-controller and it's also used to bleed the 105VDC power supply. Henrik Olsson published a circuit back in 2008. I searched google and

Re: [Emc-users] Protection from back EMF?

On 15 June 2018 at 00:40, Chris Albertson wrote: > What are people doing with DC brushed motors that work with currents > up to a couple tens of amps? On my RobotWars robot (that had DC motors running hundreds of amps) I fitted off-the-shelf bridge rectifier modules across the motors to dump

[Emc-users] Protection from back EMF?

This is a general motion controller question A couple days ago I blew up a pair of mosfets What I think happened was I had a motor going forward then switched to reverse. Basically slammed over. The motor likely developed it's full stall current of 21 amps. This blew the fuse I had on

[Emc-users] Sorry

I don't know how I trampled your thread so badly Andy . -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot

Re: [Emc-users] Interesting gear hobs

On 14 June 2018 at 19:51, Henk du preez wrote: > I think those can only be used to cut a specific size gearset with specific > ratio. This article: http://gearsolutions.com/features/high-performance-gear-cuts-a-path-to-stronger-bevel-gears/ Seems to suggest that the wheel and pinion are cut

Re: [Emc-users] Interesting gear hobs

I think those can only be used to cut a specific size gearset with specific ratio. Henk On Thu, 14 Jun 2018, 20:40 wrote: > Send Emc-users mailing list submissions to > emc-users@lists.sourceforge.net > > To subscribe or unsubscribe via the World Wide Web, visit >

Re: [Emc-users] Wester servo design

IMG_20180614_130755.jpg IMG_20180614_130806.jpg IMG_20180614_130819.jpg

[Emc-users] Fwd: Wester servo design

-- Forwarded message - From: jeremy youngs Date: Thu, Jun 14, 2018, 1:15 PM Subject: Wester servo design To: Enhanced Machine Controller (EMC) Good day fellas. I received these Western servo design power supply and brush less amplifiers. I have hounded the manufacturer to no

[Emc-users] Wester servo design

Good day fellas. I received these Western servo design power supply and brush less amplifiers. I have hounded the manufacturer to no avail for user manual. There is a short 2 page spec sheet for each device available at wsdi.com I need to know how to identify these connectors, so I can Interface

Re: [Emc-users] Interesting gear hobs

On 14 June 2018 at 18:12, John Dammeyer wrote: > Be interesting to see a Youtube video of those in action. I had a look (search "palloid" ) but both videos are terrible. -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses,

Re: [Emc-users] Interesting gear hobs

Be interesting to see a Youtube video of those in action. John > -Original Message- > From: andy pugh [mailto:bodge...@gmail.com] > Sent: June-14-18 3:03 AM > To: Enhanced Machine Controller (EMC) > Subject: [Emc-users] Interesting gear hobs > >

[Emc-users] Interesting gear hobs

https://www.ebay.co.uk/itm/Two-palloid-gear-cutters-KLINGELNBERG-hobs-3-5-MOD-for-spiral-bevel-gears/302648042420 For hobbing spiral bevels. -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." —