Mach 3 control of DC Brushless motor?

[templecorran]

I'm keen to get a DC Brushless motor (DCBM) going much like Jeremy did for his spindle project ( is it really 2 years ago?).

Mach claims to have a PWM output, has anyone tried using that to drive the DCBM driver module?

I'm hoping that this is a solution to the noise my router makes! Also most routers aren't rated for more that 3 or 4 minutes running anyway. I typically run mine for up to 1 hour.

the duty cycle topic is discussed else where

John

[HankMcSpank]

Can't answer your querey, but as someone who was equally concerned about spindle noise levels, one solution is a Proxxon BFW 40/E spindle.

AudioAndy lent me his, here's his video of it in action...



it's astonishingly quiet. The only downside is that its max RPM is 7,000, there's no 6.35mm collet available & it maye be a little underpowered for some (I believe it's 250W) - but hey, you can' t have it all...if it's quiet you want and can live with those downsides, it's a contender.

[templecorran]

well, thanks for that info. That thing is so quiet I'm not convinced it is even running ... I don't see any cuttings!

I have gathered a lot of 1/4" and 1/8" shank tools so I must have the 1/4" chuck.

Starting at the beginning of Jeremy's series on the self build spindle - he is using an ER16 straight shank milling chuck. I checked and there weren't any imperial collets listed that I could see. I'm now searching for imperial milling chucks similar to the ER16 that might be made to work. I'm not afraid to run it through the lathe and make a mess! :heehee:

John

[HankMcSpank]

well, thanks for that info. That thing is so quiet I'm not convinced it is even running ... I don't see any cuttings!

I have gathered a lot of 1/4" and 1/8" shank tools so I must have the 1/4" chuck.

Starting at the beginning of Jeremy's series on the self build spindle - he is using an ER16 straight shank milling chuck. I checked and there weren't any imperial collets listed that I could see. I'm now searching for imperial milling chucks similar to the ER16 that might be made to work. I'm not afraid to run it through the lathe and make a mess! :heehee:

John

well it was running! (& as I have it at the minute, I can confirm it really is that quiet)

The collets that come with it are 2mm, 3mm, 3.2mm, 4mm, 5mm & 6mm.

I'm considering buying an extra Proxxon 6mm collet & boring out the extra 0.35mm needed! (because if I ever need to use a 1/4" bit...it'd be for 'grunt work' & therefore accuracy wouldn't be key, so the little runout I cause shouldn't be a problem! )

[templecorran]

in the past 30 something minutes I have found some interesting things out there in .net land

ER11 C8 100L (ebay ref 170370225742) and ER11 16mm dia (ebay ref 110391685240) (only good for a few days until the time's up)

However I also found Specifications for these collets, which all you mechanical engineering types knew already.
Bottom line is that I can easily make use of either the 8mm dia or 16mm dia chucks and attach them to a DCBM.

Now ... off autocad land to make some drawings

John

[John S]

What about this one

http://www.arceurotrade.co.uk/Catalo...-Collet-Chucks

Part way down the page, ER 16 on a 20mm parallel shank.

ER16's are good to 10mm
I suspect you have found out but they close a full mm so they will hold any size.

6 to 7mm will hold 6mm and 1/4", 3 to 3.5 will hold 3mm or 1/8" and 9 to 10 will hold 3/8" and 10mm so you only need about 4 collets to hold eith standard sized cutters.

[Jonathan]

'similar parameters to the Radio Controller Modules'

You might fins what I've posted on this thread (towards the end) very relavant:

http://www.mycncuk.com/forums/showth...it-ll-cut-ally

[M250cnc]

Have you considered a water cooled spindle

They come in ER16 size you need a VFD to use & control the speed OK in Mach3

They run from 8 to 24K

As they use water for cooling they should be pretty quiet as it's the air cooling fan that makes the noise in routers

Search for lovehappy shopping on that well known auction site he has a good reputation

Phil