Re: [Emc-users] MPG detents

On Wednesday 08 March 2017 21:17:09 Gene Heskett wrote: > On Wednesday 08 March 2017 16:21:03 Gene Heskett wrote: > > On Thursday 02 March 2017 14:02:30 Gene Heskett wrote: > > > On Thursday 02 March 2017 13:53:32 Kurt Jacobson wrote: > > > > There should be a flat rubber gasket with holes for

Re: [Emc-users] MPG detents

Gene, What you want is not a diode but a differential line receiver. Not surprised at all that when you look at one half of the signal you see a lot of noise. The receivers will eliminate the common mode noise problem near completely. You Cat-5 cable is already set up for this kind of

Re: [Emc-users] MPG detents

On Wednesday 08 March 2017 16:21:03 Gene Heskett wrote: > On Thursday 02 March 2017 14:02:30 Gene Heskett wrote: > > On Thursday 02 March 2017 13:53:32 Kurt Jacobson wrote: > > > There should be a flat rubber gasket with holes for the three > > > mounting studs. If not I guess it would be a good

Re: [Emc-users] MPG detents

On Thursday 02 March 2017 14:02:30 Gene Heskett wrote: > On Thursday 02 March 2017 13:53:32 Kurt Jacobson wrote: > > There should be a flat rubber gasket with holes for the three > > mounting studs. If not I guess it would be a good idea to use some > > sort of "goop" to seal the interface and

Re: [Emc-users] MPG detents

On Thursday 02 March 2017 13:53:32 Kurt Jacobson wrote: > There should be a flat rubber gasket with holes for the three mounting > studs. If not I guess it would be a good idea to use some sort of > "goop" to seal the interface and keep coolent from getting to the > encoder. > > Kurt Jacobson >

Re: [Emc-users] MPG detents

There should be a flat rubber gasket with holes for the three mounting studs. If not I guess it would be a good idea to use some sort of "goop" to seal the interface and keep coolent from getting to the encoder. Kurt Jacobson 505-303-1933 Sent from Mobile On Mar 2, 2017 1:36 PM, "Gene Heskett"

Re: [Emc-users] MPG detents

On Thursday 02 March 2017 11:05:58 Kurt Jacobson wrote: > > Looking at the design it looks like it ought to be pretty > > coolant-proof, is that your impression? > > Yes Andy, looks like it would be quite coolant proof as long as the > gasket where the MPG mounts to the panel is in place. > Humm,

Re: [Emc-users] MPG detents

On Thursday 02 March 2017 08:36:54 andy pugh wrote: > On 2 March 2017 at 03:08, Kurt Jacobson wrote: > > Since there has been a significant amount of discussion about the > > cheap MPGs I decided to take mine apart and find out how they work. > > I took a bunch of

Re: [Emc-users] MPG detents

On 03/02/2017 04:10 AM, Gene Heskett wrote: > > But, but, but, I don't have an axis selection switch Jon, I will have a > wheel per axis. > > Well, I really like the axis selector. And I can control spindle override and feedrate override from the same MPG. I really LIKE that I can't

Re: [Emc-users] MPG detents

> > Looking at the design it looks like it ought to be pretty coolant-proof, > is that your impression? Yes Andy, looks like it would be quite coolant proof as long as the gasket where the MPG mounts to the panel is in place. On Thu, Mar 2, 2017 at 8:36 AM, andy pugh wrote:

Re: [Emc-users] MPG detents

On 2 March 2017 at 03:08, Kurt Jacobson wrote: > Since there has been a significant amount of discussion about the cheap > MPGs I decided to take mine apart and find out how they work. I took a > bunch of pictures during the disassembly, you can find them here: >

Re: [Emc-users] MPG detents

On Thursday 02 March 2017 01:11:22 Jon Elson wrote: > On 03/01/2017 10:16 PM, Gene Heskett wrote: > > On Wednesday 01 March 2017 22:31:31 Jon Elson wrote: > > > > I also have a button that has to be held to enable jogging, > > so there will be no jitter (or movement at all) when that > > button

[Emc-users] MPG detents

Thanks Kurt. I hope you can get that top sticker back on without any damage. For a low cost device, I expected a much lower parts count. If I had just that PCB made locally it would come out at about $8 It's often disheartening that whatever you might consider making, the Chinese are pumping

Re: [Emc-users] MPG detents

On 03/01/2017 10:16 PM, Gene Heskett wrote: > On Wednesday 01 March 2017 22:31:31 Jon Elson wrote: > > I also have a button that has to be held to enable jogging, > so there will be no jitter (or movement at all) when that > button is not being pressed. That saves me from accidents > when I bump

Re: [Emc-users] MPG detents

On Wednesday 01 March 2017 23:47:59 Kurt Jacobson wrote: > > What sort of bearings if any does the shaft spin in? > > Gene, I don't want to remove the encoder disk as it has to be > positioned just right, but I can just see through the encode slots > what looks to be the outer race and metal

Re: [Emc-users] MPG detents

> > What sort of bearings if any does the shaft spin in? Gene, I don't want to remove the encoder disk as it has to be positioned just right, but I can just see through the encode slots what looks to be the outer race and metal shield of a small ball bearing that the shaft runs in. Pretty

Re: [Emc-users] MPG detents

eply-To: "Enhanced Machine Controller (EMC)" > >> <emc-users@lists.sourceforge.net> > >> To: emc-users@lists.sourceforge.net > >> Subject: Re: [Emc-users] MPG detents > >> > >> On 03/01/2017 04:42 AM, Roland Jollivet wrote: > &g

Re: [Emc-users] MPG detents

On 03/02/17 10:31, Jon Elson wrote: > ---snip--- > I use a 100 "pulse" MPG, and the encoder counter counts all > transitions, and have no problem with jitter, and can count > off the detent clicks by feel. There isn't much jitter on a > 100 pulse/rev encoder, especially with the detent. > I

Re: [Emc-users] MPG detents

On Wednesday 01 March 2017 22:08:50 Kurt Jacobson wrote: > Since there has been a significant amount of discussion about the > cheap MPGs I decided to take mine apart and find out how they work. I > took a bunch of pictures during the disassembly, you can find them > here:

Re: [Emc-users] MPG detents

emc-users@lists.sourceforge.net> >> To: emc-users@lists.sourceforge.net >> Subject: Re: [Emc-users] MPG detents >> >> On 03/01/2017 04:42 AM, Roland Jollivet wrote: >>> I had always assumed that machine MPG's generated one state change per >>> click, but foll

Re: [Emc-users] MPG detents

On 03/01/2017 12:19 PM, Roland Jollivet wrote: > I presume then, that if you feed a binary increment into > LCNC, instead of a quadrature increment, it would show an > error state? Maybe, depending on how the digital filter works. It might just ignore all illegal state transitions, and

Re: [Emc-users] MPG detents

Since there has been a significant amount of discussion about the cheap MPGs I decided to take mine apart and find out how they work. I took a bunch of pictures during the disassembly, you can find them here: https://goo.gl/photos/w8fJaFLzzUsFzfmV7 It turns out that they use a simple flat spring

Re: [Emc-users] MPG detents

On Wednesday 01 March 2017 07:42:17 Roland Jollivet wrote: > I had always assumed that machine MPG's generated one state change per > click, but following Gene's discussion, I pulled out my 1988 Fanuc > MPG, and saw that it was also 4-states per click. Obviously, one > 'pulse'/detent > > Does

Re: [Emc-users] MPG detents

On Wed, 1 Mar 2017, Kirk Wallace wrote: > Date: Wed, 1 Mar 2017 09:55:49 -0800 > From: Kirk Wallace <kwall...@wallacecompany.com> > Reply-To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > To: emc-users@lists.sourceforge.net &

Re: [Emc-users] MPG detents

On 1 March 2017 at 19:55, Kirk Wallace wrote: > On 03/01/2017 04:42 AM, Roland Jollivet wrote: > > I had always assumed that machine MPG's generated one state change per > > click, but following Gene's discussion, I pulled out my 1988 Fanuc MPG, > and > > saw that it

Re: [Emc-users] MPG detents

On 03/01/2017 06:42 AM, Roland Jollivet wrote: > I had always assumed that machine MPG's generated one state change per > click, but following Gene's discussion, I pulled out my 1988 Fanuc MPG, and > saw that it was also 4-states per click. Obviously, one 'pulse'/detent > > Does anyone know the

Re: [Emc-users] MPG detents

On 03/01/2017 04:42 AM, Roland Jollivet wrote: > I had always assumed that machine MPG's generated one state change per > click, but following Gene's discussion, I pulled out my 1988 Fanuc MPG, and > saw that it was also 4-states per click. Obviously, one 'pulse'/detent > > Does anyone know the

Re: [Emc-users] MPG detents

I've learned to use the spinny knob on the BP Discovery 308 but at first missed the detent... JT On 3/1/2017 10:57 AM, Roland Jollivet wrote: > I thought that if 100 detents and 1tick/detent was all that was needed, > then it would be simple to make. 400 ticks/rev is still do-able, but >

Re: [Emc-users] MPG detents

Oh, you are planning to MAKE the encoder? You can always salvage one off an old printer or copy machine. I've found encoder wheels with thousands of divisions and the optical sensor to read them. Also you can find good plastic gears and you can make a geared encoder that runs faster then the

Re: [Emc-users] MPG detents

On 03/01/2017 11:31 AM, Chris Albertson wrote: > I think when you design one of these you have freedom to define the > mechanical detents per revolution and the number of encoder "ticks" per > revolution independently. You are arguing for these numbers to always be > the same. But why? Why

[Emc-users] MPG detents

I thought that if 100 detents and 1tick/detent was all that was needed, then it would be simple to make. 400 ticks/rev is still do-able, but anything above that means a purchased encoder, and then the incentive is lost. I think the detent is invaluable where any overshoot will crash the tool.

Re: [Emc-users] MPG detents

I think when you design one of these you have freedom to define the mechanical detents per revolution and the number of encoder "ticks" per revolution independently. You are arguing for these numbers to always be the same. But why? Why not 10 ticks per detent? I think with a jog wheel the

Re: [Emc-users] MPG detents

Thanks, got it.. Roland On 1 March 2017 at 17:11, Kurt Jacobson wrote: > There is no "divide by 4", the machine just moves in increments that are > one fourth the jog increment. For example if you have the increment set to > .001 the machine will move .00025 four

Re: [Emc-users] MPG detents

There is no "divide by 4", the machine just moves in increments that are one fourth the jog increment. For example if you have the increment set to .001 the machine will move .00025 four times per detent, which does result in 4 times smother moment. Kurt On Wed, Mar 1, 2017 at 10:01 AM, Roland

[Emc-users] MPG detents

On 1 March 2017 at 16:02, John Kasunich wrote: > > > On Wed, Mar 1, 2017, at 07:42 AM, Roland Jollivet wrote: > > I had always assumed that machine MPG's generated one state change per > > click, but following Gene's discussion, I pulled out my 1988 Fanuc MPG, > and > >

Re: [Emc-users] MPG detents

On Wed, Mar 1, 2017, at 07:42 AM, Roland Jollivet wrote: > I had always assumed that machine MPG's generated one state change per > click, but following Gene's discussion, I pulled out my 1988 Fanuc MPG, and > saw that it was also 4-states per click. Obviously, one 'pulse'/detent > > Does

[Emc-users] MPG detents

I had always assumed that machine MPG's generated one state change per click, but following Gene's discussion, I pulled out my 1988 Fanuc MPG, and saw that it was also 4-states per click. Obviously, one 'pulse'/detent Does anyone know the rationale behind this? I assumed one always wants one step