Re: [Emc-users] Nice old iron

Do not let "stored outside" frighten you in my garden for many years to restored and running http://www.collection.archivist.info/searchv13.php?searchstr=filing+new about a week of restoration and another that was usable after a day or two

Re: [Emc-users] Nice old iron

I must say I do hate it when machinery is "stored outside". It shows a distinct lack of respect -- and perhaps more realistically a lack of indoor space. The poor fellow needs a bigger workshop. Marcus On 3 Sep 2016, at 02:36, Jon Elson wrote: > On 09/02/2016 03:50 PM, andy pugh wrote: >>

Re: [Emc-users] Upset old fart

The Logan company is still in business, and Scott Logan is often seen on some of the hobby metalworking sites. He does have more support for the lathes but might be able to help on a shaper. http://www.loganact.com/ ron ginger > rayj > Subject: Re: [Emc-users] >

Re: [Emc-users] How do stepper drivers work?

From the user side, you provide 5v step/dir signals and need to pay attention to which active edge the driver uses, and know the microstep multiplier inside the drive. Inside, it's a constant-current PWM. If it's microstepping, it advances through a sinusoidal approximation of current

Re: [Emc-users] Suitability question

On Saturday 03 September 2016 09:58:45 andy pugh wrote: > On 3 September 2016 at 03:52, Gene Heskett wrote: > > No common sense west of the big pond... > > I have observed that from here :-) > > If you are making a thread for your own use you do not need to stick > to any

Re: [Emc-users] How do stepper drivers work?

On 09/03/2016 10:58 AM, Chris Albertson wrote: > I want to understand stepper motor controllers. This is my goto document for steppers: http://homepage.cs.uiowa.edu/~jones/step/ -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/

Re: [Emc-users] How do stepper drivers work?

> On 3 Sep 2016, at 20:58, Chris Albertson wrote: > > Is it as simple as that? A constant current power supply and some MOSFET > H-bridge switches? Yes, but probably no :-) It's a closed-loop constant current supply, with current feedback. And I suspect that there

Re: [Emc-users] Suitability question

On 3 September 2016 at 03:52, Gene Heskett wrote: > No common sense west of the big pond... I have observed that from here :-) If you are making a thread for your own use you do not need to stick to any standard. My drawbar is held together by an M14.25 x 0.9 thread.

Re: [Emc-users] Nice old iron

> On 3 Sep 2016, at 13:26, Dave Caroline wrote: > > Marcus often internal slides and even external if a good metal will > not have lost enough in rusting to make them unusable and any original > oil can keep most in reasonable condition for a number of years.

Re: [Emc-users] Upset old fart

Thanks for the info! Guess I should have done more research before I put the question out. Thanks again. Raymond Julian Kettle River, MN The things we admire in men, kindness and generosity, openness, honesty, understanding and feeling are the concomitants of failure in our system. And

[Emc-users] How do stepper drivers work?

I want to understand stepper motor controllers. Yes I know I can just read the specs and buy one but I want to understand what's inside. Preferably someone has a link My use of stepper motors has been, I guess primitive. I can write software to toggle bits on an output port and then I connect

Re: [Emc-users] How do stepper drivers work?

> On 3 Sep 2016, at 21:12, Danny Miller wrote: > > l approximation of current targets whose PEAK value > is equal to the motor current rating. Are you sure? I don't have any information at all but would expect it to be average current.

Re: [Emc-users] touch probe

motion.feed-inhibit would be the one to use. only (maybe) homing and synch moves are un fazed by it. It can't be masked either. Chris M From: Jon Elson Sent: September 4, 2016 12:42 AM To: Enhanced Machine Controller (EMC) Subject:

Re: [Emc-users] How do stepper drivers work?

Stepper motors' drive is AC-like if moving, but DC when stopped. There is a common misconception that you target average current, but that's not correct. There are two windings in bipolar steppers. If you have a motor rated at 2 amps with 2 ohm DC winding, that rating allows 2A, 8W total,

Re: [Emc-users] How do stepper drivers work?

On 09/03/2016 11:32 AM, Andy Pugh wrote: > > >> On 3 Sep 2016, at 21:12, Danny Miller >> wrote: >> >> l approximation of current targets whose PEAK value is equal to the >> motor current rating. > > Are you sure? I don't have any information at all but would expect it > to

Re: [Emc-users] Nice old iron

I sold a circa 1935 B No. 2 surface grinder that had sat outside for who knows how long, but the slideways on the table looked factory new with all the original scraping marks, despite the paint all peeling off and rust all over. Lube is life to machine tools. :) From: Dave Caroline

Re: [Emc-users] How do stepper drivers work?

On Saturday 03 September 2016 13:58:15 Chris Albertson wrote: > I want to understand stepper motor controllers. Yes I know I can > just read the specs and buy one but I want to understand what's > inside. Preferably someone has a link > > My use of stepper motors has been, I guess primitive. I

[Emc-users] touch probe

Does anybody know if the touch probe gcode (G38) obeys motion.feed-hold? (I'm guessing it should, but wondered if anybody knew?) This Blum probe I got has IR communication, and sends a single serial byte every 16 ms when there is no event, and sends a byte immediately when there is a change

[Emc-users] Logan parts Re: Upset old fart

Ask Scott Logan at lathe.com He has new old stock and new parts for Logan lathes, dunno about their shapers. From: rayj To: Enhanced Machine Controller (EMC) Sent: Friday, September 2, 2016 6:54 PM Subject: Re: [Emc-users]

Re: [Emc-users] What does "CNC" really mean?

That joke is 16 years old. :P From: Gene Heskett To: emc-users@lists.sourceforge.net Sent: Friday, September 2, 2016 3:57 PM Subject: Re: [Emc-users] What does "CNC" really mean? On Friday 02 September 2016 13:42:09 Dave Cole wrote: > And what about hanging

Re: [Emc-users] What does "CNC" really mean?

On Saturday 03 September 2016 06:31:21 Gregg Eshelman wrote: > That joke is 16 years old. :P > > Precisely Gregg. ;-) > From: Gene Heskett > To: emc-users@lists.sourceforge.net > Sent: Friday, September 2, 2016 3:57 PM > Subject: Re: [Emc-users] What does "CNC"

Re: [Emc-users] Nice old iron

Impressive. And good looking too. What about the parts that are supposed to be close sliding fits, like the tailstock barrel etc? Marcus On 3 Sep 2016, at 08:51, Dave Caroline wrote: > Do not let "stored outside" frighten you > in my garden for many years to restored and running >

Re: [Emc-users] Nice old iron

Marcus often internal slides and even external if a good metal will not have lost enough in rusting to make them unusable and any original oil can keep most in reasonable condition for a number of years. When you clean the surface rust with a scraper (not too sharp) and or wire brush you can still