Vardex H3/8".205"-I18UNCTM

EDIT: That part# might be invalid. Checking now.

This is how I end my programs on a HAAS;

G00Z0.1M09
M05
G91G28Z0.
G00G90G53X-15.5Y0.
M30

Then I just change the X move when I need to.

Hanita Varimill, step over like .075"

So Dwain Dyer, what's the verdict?

AHA! Now I understand. Thanks Doug! I've never used the spindle face to touch off though. I always used the surface of my edge finder. Hand tight in a collet so it'll slide up in case of accident. Slide it back and forth and when it hits it'll stop moving.

EDIT: Well, not always. I started doing it that way a few years back. Edge finder is already in there for X and Y, figured use it for Z too.

And MotorCityMinion, it seems we are in agreement that the face of the spindle should match up with the gage diameter. The problem is that they have tolerance on it. Check the Machinery's Handbook, section on machine spindle tapers.

I kind of understand where you are coming from, but;

Wouldn't the fixture 'Z' offset zero out the error?

For the sake of argument the tool length on your presetter is exactly 4.0000".

This is measured from the true gage line at precisely 1.750" diameter.

You have 3 identical machines.

Machine #1 gage line is exactly at spindle face, tool jogs down to top of probe, measures -16.0000"

Machine #2 gage line is +.015" from spindle face, tool jogs down to top of probe, measures -16.0150"

Machine #3 gage line is -.015" from spindle face, tool jogs down to top of probe, measures -15.9850"

Isn't the tool going to go to the top of probe when you program Z0 on all three?

Yeah, it's not that critical, unless you know of a reason to state otherwise. Like I said, the gage diameter of 1.75" is the critical dimension. But the face of the spindle is ±.015" from that. And like the OP said, his spindle face doesn't appear to be precision ground. What happens when you have a spindle reground? Do they also regrind the face?

EDIT: Those are actual questions. And keep in mind we aren't talking about dual contact stuff. Also, does anyone have a reason on why the exact gage line would be critical?

Thanks Chris. Would this be something I could do with a buffer? I am thinking something like this thread. If I could, then I am thinking preadbuf could have a switch for G41/G42.

Sound like a reasonable start, or no? I am reading through the post processor reference guide, so not looking for a total handout!

Thanks in advance for any and all replies.

Is the flat face on the spindle the gage line? I didnt think it was because it doesnt look like a precision surface on our spindle. I am familiar with the Zoller, but I just need to do one tool. I found a spec that said 1.75" was the ggae line diameter on the taper, so i guess i could just get the distance on the cmm knowing that. I figured that had to be an easier way to do it. either on the machine or on a surface plate.

Yes, the flat face is BASICALLY the gage line. 1.75" is correct (for a 40 taper). But the tolerance is ±.015" in Z off of that. Since tool length offset and fixture z offset are relative, the exact number isn't really all that critical. Unless you are doing 5axis work I think.

Why not put a test indicator in the machine, zero out on the bottom of the pin, then zero out your position page. Z down to the spindle face?

Cut your spindle speed in half. And I'd go down to like a .005" finish pass.

And I'd try a 7/16" endmill and plungemill to rough it out.

How can I get the tooltable to only output "D" values for tools that are using cutter comp?

Right now I have:

(T1  H1  D51 1" BULL ENDMILL 0.016" RAD   )
(T2  H2      1/2" FLAT ENDMILL            )
(T3  H3  D53 1" BALL ENDMILL              )
(T4  H4      3/8" FLAT ENDMILL            )
(T5  H5      3/16"X90 D/MILL              )
(T6  H6      3/16" FLAT ENDMILL           )
(T7  H7      1/8" FLAT ENDMILL            )
(T8  H8      #30 DRILL                    )
(T9  H9      #6-32 TAPRH                  )
(T10 H10     #34 DRILL                    )

And I'd rather have something like:

(T1  H1      1" BULL ENDMILL 0.016" RAD   )
(T2  H2      1/2" FLAT ENDMILL            )
(T3  H3  D53 1" BALL ENDMILL              )
(T4  H4  D54 3/8" FLAT ENDMILL            )
(T5  H5      3/16"X90 D/MILL              )
(T6  H6  D56 3/16" FLAT ENDMILL           )
(T7  H7  D57 1/8" FLAT ENDMILL            )
(T8  H8      #30 DRILL                    )
(T9  H9      #6-32 TAPRH                  )
(T10 H10     #34 DRILL                    )

Post is mpmaster for V9. I've been playing around in the ptooltable section, but I can't figure out what tcr should be to get it to work.;

          if t >= zero,
            [
            if tcr>0, "(", *t, ptspace, " ", *tlngnote, phspace, " ", *toffnote, pdspace, pbspace, plistcomm, ")"
            if tcr=0, "(", *t, ptspace, " ", *tlngnote, phspace, " ", pbspace, plistcomm, ")"
            ]

Thanks in advance for any and all replies!

I thought it was so that if any bad sh1t happened the part was more likely to be thrown down instead of up?

Um, File>Save Page As...

Or, just remember 25.4/metric pitch equals tpi.

From the book;

With G90

G10 L2 P5 X1.356 Y2.63 Z-.01 (This replaces the current value of fixture offset #5 with X1.356 Y2.63 Z-.01).

With G91

G10 L2 P5 X-1. (This subtracts one inch from the current X value of fixture offset #5).

or more simply: 25.4/pitch = tpi

That's how I've always done it. Seems pretty straightforward to me.

How I remember it:

N1 #FX1 = 0.000

N2 #FY1 = 0.000

N3 #FZ1 = 0.000

N4 #FX2 = 0.000

N5 #FY2 = 0.000

N6 #FZ2 = 0.000

etc.

And they should be ok anywhere in the program.

I can double check some old programs when I get home if you don't get it by then.

Vardex threadmills rock.

Here's a xls spreadsheet I made for programming. It gives the gage line major diameter that you should program to, the depth to get 2 extra turns past the wrench makeup length (like 5 turns past the gage length), and the drill diameter.

Just need to change the extension back to .xls

EDIT;

Brain fart. Accidentally put Iscar instead of Vardex. Iscar actually sucks.

NPT THREADMILL DEPTH.txt

Harry Watt square drill bit.

http://en.wikipedia.org/wiki/Reuleaux_triangle

http://linearlyindependent.blogspot.com/2008/07/drilling-square-holes.html

I found 90º tools.

Reading comprehension>me

NM

NM, wrong angle

Aha, thanks!