Re: [Emc-users] Mounting spindle sensors.

1 7:18 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Mounting spindle sensors. > > Yes, and an easier way to verify is to think the 60 RPM = 1 Rev. per > second. So you need 60 slots per rev to give 60 Hz at 1 rev per second. > > But why bother making the math eas

Re: [Emc-users] Mounting spindle sensors.

on it in case > electrical noise is an issue. At the moment it's not populated. > > > -Original Message- > > From: John Dammeyer [mailto:jo...@autoartisans.com] > > Sent: July-02-21 8:30 PM > > To: 'Enhanced Machine Controller (EMC)' > > Subject: Re: [

Re: [Emc-users] Mounting spindle sensors.

And here's the drawing. The exact part number of the sensors are: OPB991T11Z https://www.digikey.ca/en/products/detail/tt-electronics-optek-technology/OPB991T11Z/1637795 These are already set up with a voltage regulator, Schmitt trigger and a driven Open Collector transistor. John Dammeyer

Re: [Emc-users] Mounting spindle sensors.

> I am prepared to state categorically that it must be a coincidence as > "math" was not a word in Douglas Adams's lexicon. As a speaker of > British English he would have always used "maths" as the shorter > version of "mathematics" > Hi Andy, That's the same comments I've heard. However,

Re: [Emc-users] Mounting spindle sensors.

and "untrip" points far enough apart on the ramp, so there is no ambiguity. On Fri, Jul 2, 2021 at 12:01 AM John Dammeyer wrote: > > From: Gene Heskett [mailto:ghesk...@shentel.net] > > Subject: Re: [Emc-users] Mounting spindle sensors. > > > > On Frid

Re: [Emc-users] Mounting spindle sensors.

On Fri, 2 Jul 2021 at 08:01, John Dammeyer wrote: > although there are claims that it's a coincidence, if you take the letters > of the alphabet and assign a number to each. > A=1, B=2, C=3, ... Z=26 > and add but the numbers for the word "MATH" you get 42. I am prepared to state

Re: [Emc-users] Mounting spindle sensors.

> From: Gene Heskett [mailto:ghesk...@shentel.net] > Subject: Re: [Emc-users] Mounting spindle sensors. > > On Friday 02 July 2021 01:42:25 John Dammeyer wrote: > > > Progress. This will ultimately be metal since I don't trust the > > plastic to be stable and the en

Re: [Emc-users] Mounting spindle sensors.

On Friday 02 July 2021 01:42:25 John Dammeyer wrote: > Progress. This will ultimately be metal since I don't trust the > plastic to be stable and the encoder disk is perhaps a tad thick for > the slotted sensors. What you see underneath the yellow plate are > stiffeners. Likely a 6mm thick

Re: [Emc-users] Mounting spindle sensors.

> From: John Dammeyer [mailto:jo...@autoartisans.com] > Yeah not exclusive. I screw up all the time. In this case, the problem was > that when I changed the Knee from Stepper to Servo I > changed the pulley. Most of it slides on the shaft but there's no key. So > instead I used the set

Re: [Emc-users] Mounting spindle sensors.

> From: Gene Heskett [mailto:ghesk...@shentel.net] > > I've started on a mist system but it's currently project #42 so it > > might be a while yet. > > I've found its extremely useful, so I'd move it up the list to > considerably higher than 42. Hi Gene, your comments reinforce that it's a

Re: [Emc-users] Mounting spindle sensors.

Video from 2009. Milling a hard metal file at 125 ipm with no cooling and from a start temp of 81F the file only warmed to 89Fhttps://www.youtube.com/watch?v=DeJCzN90Aj4 I couldn't find the video from a shop that resharpened end mills, showing one rapidly carving the faces of a hard file held

Re: [Emc-users] Mounting spindle sensors.

> I've found its extremely useful, so I'd move it up the list to > considerably higher than 42. This "mist" can be quite dry and still do a > great job without making a big mess. It shines particularly well when > doing alu that gets gummy when it even thinks about more than room > temps, I cut

Re: [Emc-users] Mounting spindle sensors.

On Thu, 1 Jul 2021 at 08:35, John Dammeyer wrote: > I don't have a broach although with the spindle locked by the Servo I could > theoretically write G-Code to use some sort of tool to broach like a vertical > shaper You can make a broach, if you have a lathe. Start with a piece of square

Re: [Emc-users] Mounting spindle sensors.

On Thursday 01 July 2021 03:31:56 John Dammeyer wrote: > > From: marcus.bow...@visible.eclipse.co.uk > > [mailto:marcus.bow...@visible.eclipse.co.uk] > > > > On 2021-07-01 02:54, John Dammeyer wrote: > > > With a bit of oil on the part the chips come off > > > smoking. > > > > A little more oil

Re: [Emc-users] Mounting spindle sensors.

The feed and spindle speed looks about right. I'd use carbide then double or triple feed + speed. With carbide in steel, coolant/oil is optional. A lot depends on the rigidity of the machine and setup but I'd also probably take the cut in one pass or maybe two. Making lots of small passes is

Re: [Emc-users] Mounting spindle sensors.

John. You really really should be running carbide endmills. They can be run dry and hot for most jobs. And they are just so much nicer than hss. It's great when you don't have to think to much about if the cutter is going to overheat. And more just about what shape you want to cut. Pm me and

Re: [Emc-users] Mounting spindle sensors.

On 2021-07-01 02:54, John Dammeyer wrote: With a bit of oil on the part the chips come off smoking. A little more oil will cure or at least reduce the smoking. Flood would cure it completely, but more neat oil squirted on will do the trick. How's my speed? Too fast? Too slow? Just .

Re: [Emc-users] Mounting spindle sensors.

OK. Just a quick video with of course some questions. https://youtu.be/BpafBR_Cfuw Here's the cutting of one flat. As the video comments state: Spindle RPM 833, Feed Rate 3 ipm, Cutter size 14mm (0.55") Stepover is 0.15" or about 25% of cutter diameter (2 flute HSS) Depth of cut is 0.025" per

Re: [Emc-users] Mounting spindle sensors.

> From: andy pugh [mailto:bodge...@gmail.com] > On Wed, 30 Jun 2021 at 08:54, John Dammeyer wrote: > > > I couild buy a couple of bolts but might spend more time and fuel looking > > for a couple to buy than using free cast-off bits in the > junk pail. > > That does leave the (more work)

Re: [Emc-users] Mounting spindle sensors.

On Wed, 30 Jun 2021 at 08:54, John Dammeyer wrote: > I couild buy a couple of bolts but might spend more time and fuel looking for > a couple to buy than using free cast-off bits in the junk pail. That does leave the (more work) option of making special bolts with stud heads. I see them

Re: [Emc-users] Mounting spindle sensors.

> From: andy pugh [mailto:bodge...@gmail.com] > On Wed, 30 Jun 2021 at 00:57, John Dammeyer wrote: > > > Well, sure enough... > > Another advantage of tapping the bolt and not the casting > > > -- > atp Of course the mill was apart in more than one place when this happened but I've

Re: [Emc-users] Mounting spindle sensors.

On Wed, 30 Jun 2021 at 00:57, John Dammeyer wrote: > Well, sure enough... Another advantage of tapping the bolt and not the casting -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." —

Re: [Emc-users] Mounting spindle sensors.

The angle iron would only provide a base for mounting the sensors. The vertical part could be used for cable clamps, so that the cables are directed down (relative to the position in the picture), not radially. The sensors would be positioned in an arc, of course, not aligned to the straight

Re: [Emc-users] Mounting spindle sensors.

Hi I'd go for something similar to the picture, but simpler. Make the two cylinders and use a piece of angle iron for the sensor support. Two holes for the bolts to go through. Offset so that the side of the angle that is parallel to the shaft (and the bolts) clears the outside of the round

Re: [Emc-users] Mounting spindle sensors.

Good point. Thanks John > -Original Message- > From: Les Newell [mailto:les.new...@fastmail.co.uk] > Sent: June-29-21 3:22 PM > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] Mounting spindle sensors. > > > When the drawing is rotated you can

Re: [Emc-users] Mounting spindle sensors.

On Tue, 29 Jun 2021 at 23:25, Les Newell wrote: > That spacing gives you 180 degree phasing. You want 90 degree, so when > one sensor sees an edge, the other should see the centre of a tooth or > slot. It's an easy mistake to make. It is, I have made it.

Re: [Emc-users] Mounting spindle sensors.

When the drawing is rotated you can actually see the sensors are offset so one looks at the tooth and one at the slot between. That spacing gives you 180 degree phasing. You want 90 degree, so when one sensor sees an edge, the other should see the centre of a tooth or slot. It's an easy

Re: [Emc-users] Mounting spindle sensors.

at the tooth and one at the slot between. > -Original Message- > From: Les Newell [mailto:les.new...@fastmail.co.uk] > Sent: June-29-21 3:00 PM > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] Mounting spindle sensors. > > I have to admit I'd be

Re: [Emc-users] Mounting spindle sensors.

I have to admit I'd be tempted to go really basic. Bend a piece of strip steel into a L shape. Drill a 10mm hole in one leg for one of the mounting bolts to go through. Mount two slotted sensors such as these on another piece of steel. 

Re: [Emc-users] Mounting spindle sensors.

On Tue, 29 Jun 2021 at 22:34, John Dammeyer wrote: > > I often have trouble coming up with simple solutions. How about taking out two of the bolts that are visible and drilling and tapping a small hole in their heads. Then use those holes to affix a bracket to hold your sensor? This avoids