Dimensioning cylinder length

[Perry Fisher]

I'm running 3.207 Beta.

I'm programming 3 different parts all with the attached extruded hole 8 times in each part. The Ø.773 ±.002 must be held over the .100 min noted.

I'm checking the holes as cylinders. Is it possible to report the cylinder length with the diameter?

Thanks

[craiger_ny]

I believe .L (FEATNAME.L) is the extension if you want to capture it in a variable but that is the distance between rows of hits. It could be .LENGTH too, I'm not sure I've never used it.

Craig

[Perry Fisher]

What I came up with...

I believe .L (FEATNAME.L) is the extension if you want to capture it in a variable but that is the distance between rows of hits. It could be .LENGTH too, I'm not sure I've never used it.

I tried using .L which , in this case, reports the DEPTH of the first row of hits in the cylinder at .2.



This is what I came up with.

"C10_1" is my cylinder. I'm checking the cylinder with 3 rows of 5 hits each. "D12_1P2" & "D12_1P2" are generic points taken from the auto-hits around the cylinder (Thanks Lenice Evergeen & James Mannes for this hint).

C10_1 =AUTO/CYLINDER, SHOWHITS=NO, SHOWALLPARAMS=YES
THEO/0.906,1.717,-0.08,0,0,1,0.773,0.2
ACTL/0.904,1.71,0,0.0080009,-0.0055589,0.9999525,0.776,0.2
TARG/0.906,1.717,-0.08,0,0,1
THEO_THICKNESS = 0, RECT, IN, CIRCULAR, LEAST_SQR ,$
AUTO MOVE = YES, DISTANCE = 0.2, RMEAS = None, READ POS = NO, FIND HOLE = NO, REMEASURE = NO, USE THEO = YES ,$
NUMHITS = 5, NUMROWS = 3, INIT = 1, PERM = 1, SPACER = 0.25, PITCH = 0 ,$
START ANG = 0, END ANG = 360, DEPTH = 0.1 ,$
ANGLE VEC = 1,0,0
D12_1P1 =FEAT/POINT,RECT
THEO/1.025,1.349,-0.2,-0.309017,0.9510565,0
ACTL/1.025,1.345,-0.2,-0.309017,0.9510565,0
CONSTR/POINT,CAST,C10_1.HIT[5]
D12_1P2 =FEAT/POINT,RECT
THEO/1.025,1.349,-0.1,-0.309017,0.9510565,0
ACTL/1.027,1.341,-0.1,-0.309017,0.9510565,0
CONSTR/POINT,CAST,C10_1.HIT[15]

Now I can dimension between the D12 points in "Z" and show my customer the extruded cylinder meets the min .100 spec.

DIM 12_1 = 2D DISTANCE FROM POINT D12_1P1 TO POINT D12_1P2 PARALLEL TO ZAXIS, NO_RADIUS UNITS=IN ,$
GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH
AX NOMINAL MEAS +TOL -TOL DEV OUTTOL
M 0.100 0.100 0.050 0.000 0.000 0.000 <--------

This might be a Mickey Mouse method but I think I can sell it.

If someone else knows a better way I all for it.

[craiger_ny]

You are probably right on for a solution. If length does not do it I am not sure there is a field that will do it, it was a stab in the dark really. Here's another stab (I don't know why I can't get away from the length property) could you instead construct a single feature in this case a line between two hits at the opposing levels and dimension the length of the line? I don't know, this length thing is something I've never used.

Craig

[craiger_ny]

OK looking in the help file it looks like I do not know what I'm talking about. Take away my dessert and scratch the length thing.

Craig

[#2#]

I'm confused - but then when am I not confused.

It seems to me that the dimensioned length will never change. Maybe I'm wrong. I assume you need to show in the cmm report that it meets. I think what I would do is measure a bunch of circles at set intervals throughout the bore (lets say .01 inch apart). Then, all you need to do is prove that 10 sequential circles have their diameter within the tol. I'm not sure how you would report this though.

[Perry Fisher]

I think I can sell it to my customer. These are water pump parts. Nothing automotive. No PPAP required, just dimensionally correct parts.

I may try Goodluck's suggestion and see how that looks.

Thanks for the help.

[craiger_ny]

Sounds like a perfect time to use looping (I've finaly droped the .LENGTH thing).

Craig

[Perry Fisher]

Sounds like a perfect time to use looping

ARRRGGGHHH!!!!! Why didn't I think of looping. These holes are equally patterened perfect for looping.

I'll try looping the next one.

Thanks Craig

[craiger_ny]

You can loop the depth as well insted of creating a bunch of circles on top of each other. Then you could increment a variable in your loop to display the depth that the loop measured through.