Re: [Emc-users] Lathe mode tool touch off question

On Wed, 27 May 2020 at 05:12, Leonardo Marsaglia wrote: > I set the Z offset for the G54 coordinate with the facing tool that was > already set and then I took a skim cut with the new unsetted tool on the > same face (Z0 position for the workpiece) and touch off the Z axis for that > tool with a

Re: [Emc-users] Lathe mode tool touch off question

> > Perhaps it was just a very light skim cut? I doubt it, because that tool position was never used with LCNC on the lathe until yesterday. I reset the tool today and same thing happened. It appears the touch off feature is using the active coordinate system to calculate the difference at some

Re: [Emc-users] Encoder HAL programming.

> > I actually saw a youtube video where someone was using this chip. I > > believe he said it was like $28, and you'd still need something to read/run > > > > I buy them for about $3 each > ebay.com/itm/1PC-STM32F103C8T6-ARM-STM32 >

Re: [Emc-users] FERROR MIN_FERROR value?

> On Tue, 26 May 2020 at 19:45, Gene Heskett wrote: > > > I just tried an experiment. Since there are no pid's in that sheldon > > setup, I commented out the *ERROR entries in the .ini file. Interesting > > as it made zero difference in how it ran. > > That probably means that the default value

Re: [Emc-users] FERROR MIN_FERROR value?

> On Tuesday 26 May 2020 16:29:17 Chris Albertson wrote: > > > Gene, > > > > I'm also looking at using a closed-loop stepper for a z-axis drive. > > On my system the z-motor's torque holds the full weight of the head. > > With a standard open loop motor full current is used and the motor > > g

Re: [Emc-users] FERROR MIN_FERROR value?

On Wed, 27 May 2020, N wrote: Date: Wed, 27 May 2020 17:18:16 +0200 From: N Reply-To: "Enhanced Machine Controller (EMC)" To: "Enhanced Machine Controller (EMC)" Subject: Re: [Emc-users] FERROR MIN_FERROR value? On Tue, 26 May 2020 at 19:45, Gene Heskett wrote: I just tried an experi

[Emc-users] Lathe Spindle Rebuild Quistions

So after finishing the retrofit of the old Miyano gang lathe the spindle bearings are shot. You can grab the spindle nose and push it side to side about .0005" to .001". The cut quality is also fairly bad. Just cutting a spring pass on an aluminum bar shows a lot of chatter like marks. I can also

Re: [Emc-users] Lathe Spindle Rebuild Quistions

On 05/27/2020 12:18 PM, Curtis Dutton wrote: So after finishing the retrofit of the old Miyano gang lathe the spindle bearings are shot. You can grab the spindle nose and push it side to side about .0005" to .001". The cut quality is also fairly bad. Just cutting a spring pass on an aluminum bar

Re: [Emc-users] Lathe Spindle Rebuild Quistions

On Wed, 27 May 2020 at 18:21, Curtis Dutton wrote: > > I'm not opposed to trying to do it > myself but I know it would be very challenging to get it right. I'm sure > I'd need to order 2 sets of bearings... One for the first attempt and one > to get it right! Still probably cheaper than paying fo

Re: [Emc-users] Lathe Spindle Rebuild Quistions

I've never took apart the ones in the Mazak (Wich I asked for quotation once)but I disassembled other lathes that were similar and it's not that much of a pain. Surely you must make some tooling sometimes to get things done right but nothing else. 5.000 to 7.000 sounds about what they would charge

Re: [Emc-users] FERROR MIN_FERROR value?

On Wednesday 27 May 2020 11:18:16 N wrote: > > On Tue, 26 May 2020 at 19:45, Gene Heskett wrote: > > > I just tried an experiment. Since there are no pid's in that > > > sheldon setup, I commented out the *ERROR entries in the .ini > > > file. Interesting as it made zero difference in how it ra

Re: [Emc-users] Lathe Spindle Rebuild Quistions

Yes that youtube video seems to be very helpful. I've been watching it for the last few days. Well we will give it a try then and see how it pans out. Thanks all On Wed, May 27, 2020 at 2:03 PM Leonardo Marsaglia wrote: > I've never took apart the ones in the Mazak (Wich I asked for quotation

Re: [Emc-users] FERROR MIN_FERROR value?

On Wednesday 27 May 2020 11:20:46 N wrote: > > On Tuesday 26 May 2020 16:29:17 Chris Albertson wrote: > > > Gene, > > > > > > I'm also looking at using a closed-loop stepper for a z-axis > > > drive. On my system the z-motor's torque holds the full weight of > > > the head. With a standard open lo

Re: [Emc-users] FERROR MIN_FERROR value?

On Wednesday 27 May 2020 11:38:05 Peter C. Wallace wrote: > On Wed, 27 May 2020, N wrote: > > Date: Wed, 27 May 2020 17:18:16 +0200 > > From: N > > Reply-To: "Enhanced Machine Controller (EMC)" > > > > To: "Enhanced Machine Controller (EMC)" > > Subject: Re: [Emc-users] FERROR > > MIN_FERRO

Re: [Emc-users] FERROR MIN_FERROR value?

Not much math. Tie a spring scale (aka "fish scale") to an end mill placed in the chuck and pull sideways, Record the force on the scale and use a dial indicator to measure the deflection of the end mill. Plot a few points.With no math you now know the "spring" in the system. One thing, be

Re: [Emc-users] FERROR MIN_FERROR value?

On 05/27/2020 01:52 PM, Chris Albertson wrote: On Wed, May 27, 2020 at 11:34 AM Gene Heskett wrote: Have any idea how much spring there is in the iron? I know that just leaning on the head of my Bridgeport will deflect the spindle .001" easily. I often do this when using a boring bar to

Re: [Emc-users] Lathe Spindle Rebuild Quistions

I’ll chime in on the importance of a clean environment. They usually spec a ultra high purity grease for lubricant. They also usually have a fairly specific break-in routine. I.e a pair of temperature probes, one near each bearing, then run the spindle, starting at a slow speed. Gradually incre

Re: [Emc-users] FERROR MIN_FERROR value?

On Wednesday 27 May 2020 00:51:57 Gene Heskett wrote: > On Tuesday 26 May 2020 19:45:10 Chris Albertson wrote: > > On Tue, May 26, 2020 at 3:01 PM Gene Heskett > > wrote: > > > Those closed loop motors and controllers have arrived, and I > > > puzzled by a total lack of docs other than the u-step

Re: [Emc-users] Lathe Spindle Rebuild Quistions

Agreed. We will do the best we can and break in very slowly. I'll read up on break in procedures and we have temp probes that we can use to watch it. Thanks all for the info! On Wed, May 27, 2020 at 3:20 PM Thaddeus Waldner wrote: > I’ll chime in on the importance of a clean environment. They u

Re: [Emc-users] FERROR MIN_FERROR value?

By total coincidence, I just made both. I needed 30T, 40T, and 60T pulleys. I tried printing them and they fail after a while. The plastic simply will not hold the set screw then they slip on the shaft. The big thing is if the motor gets warm it heats the plastic. The solution has to print th

Re: [Emc-users] FERROR MIN_FERROR value?

On Wednesday 27 May 2020 20:10:44 Chris Albertson wrote: > By total coincidence, I just made both. I needed 30T, 40T, and 60T > pulleys. I tried printing them and they fail after a while. The > plastic simply will not hold the set screw then they slip on the > shaft. The big thing is if the m

Re: [Emc-users] FERROR MIN_FERROR value?

On Thu, 28 May 2020 at 01:13, Chris Albertson wrote: > By total coincidence, I just made both. I needed 30T, 40T, and 60T > pulleys. I tried printing them and they fail after a while. The plastic > simply will not hold the set screw then they slip on the shaft. There was an interesting solut

Re: [Emc-users] FERROR MIN_FERROR value?

On Wed, May 27, 2020 at 5:38 PM Gene Heskett wrote: > On Wednesday 27 May 2020 20:10:44 Chris Albertson wrote: > > > By total coincidence, I just made both. I needed 30T, 40T, and 60T > > pulleys. I tried printing them and they fail after a while. The > > plastic simply will not hold the set

Re: [Emc-users] FERROR MIN_FERROR value?

On Wednesday 27 May 2020 23:23:39 Chris Albertson wrote: > On Wed, May 27, 2020 at 5:38 PM Gene Heskett wrote: > > On Wednesday 27 May 2020 20:10:44 Chris Albertson wrote: > > > By total coincidence, I just made both. I needed 30T, 40T, and > > > 60T pulleys. I tried printing them and they fa

Re: [Emc-users] FERROR MIN_FERROR value?

Here’s one that I have used successfully: https://www.thingiverse.com/thing:16627 It is a parametric pulley designed in OpenScad. I believe the Thingiverse website allows you to configure openscad designs from the website, then download the.stl. But you can also download the Openscad file. .s

Re: [Emc-users] FERROR MIN_FERROR value?

I often incorporate a slot inside the gear or pulley (like a keyway) the width of a nut. Slip a nut down the slot and screw the set screw into the nut through a radial hole. Now the force is between the nut face and the plastic part (compression) rather than on fragile threads in the plastic.

Re: [Emc-users] FERROR MIN_FERROR value?

One key to good FDM printing is a steady ambient temperature *with no airflow* around the printer. A bit of a breeze can cause uneven shrinkage and warping. That's why some printers are enclosed and building a printer enclosure is a popular thing. If you're wanting to get your 3D printing feet