Lathe ID taper

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17 Feb 2012 10:12 #17752 by Rick G
Lathe ID taper was created by Rick G
Here is a sub based on John Thorton's lathe id.
This untested sub should allow you to cut an inside diameter taper on the lathe.
It assumes you...
Have an existing undersze bore.
You know the depth of the taper and the difference between the large and the small diameter of the taper, and you have checked to make sure there is adequate tool clearance.

Rick G

File Attachment:

File Name: idtaper.ngc
File Size:2 KB
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17 Feb 2012 13:13 #17757 by BigJohnT
Replied by BigJohnT on topic Re:Lathe ID taper
Dang your up early today... Thanks for sharing that Rick. I need to polish mine up a bit and post them again.

John

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04 Jan 2013 18:13 #28364 by Rick G
Replied by Rick G on topic Re:Lathe ID taper
Here is an updated id taper sub for the lathe.
It works when you have an existing hole and you want to taper to a larger diameter and know the final diameter and the depth.
It uses a different method to calculate each pass to avoid excess Z air cutting movements.
Again not tested yet, only on a sim.

Rick G
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04 Jan 2013 20:45 #28371 by andypugh
Replied by andypugh on topic Re:Lathe ID taper
I bored an internal taper last night.
However, in my case I needed to set the angle (7/24 or 16.26 degrees) and I think this may be the more common situation.
(BT30 is 16.26 degrres and a 31.75 larger dimension)

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04 Jan 2013 20:57 #28374 by BigJohnT
Replied by BigJohnT on topic Re:Lathe ID taper
Andy, do you mean it is more common to use the angle of the taper instead of the two diameters? That's what my latest Taper-OD subroutine does.

John

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04 Jan 2013 21:10 #28376 by andypugh
Replied by andypugh on topic Re:Lathe ID taper

Andy, do you mean it is more common to use the angle of the taper instead of the two diameters?

I don't know. it is certainly more common for _me_ to care about the angle, but I guess it would typically depend on how the engineering drawing was dimensioned.

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05 Jan 2013 16:54 #28394 by Rick G
Replied by Rick G on topic Re:Lathe ID taper
Interesting.

In this case I was working on a custom throttle body bore that needed a taper, I had the small diameter, the length and the large diameter.
What I wanted to avoid was excess Z moves cutting air part of the moves.
Below is a screen shot of two examples, on the left is the way I was cutting with full Z moves, on the right the newer sub.
The left took about 3 1/4 minutes the right 2 1/4 minutes at the same F4 cutting speed.

I can see the benefit and advantage of having different subs for tapers, ones that accept dimensions and ones that accept angles.

Rick G
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05 Jan 2013 20:27 #28397 by Rick G
Replied by Rick G on topic Re:Lathe ID taper
Morning John,

Looking at your od taper sub would your id taper look something like this?

(info: Taper OD, multi-pass)
o<taper-ida> sub
;#<diameter> = #1 (= 0.750 Stock Dia)
#<diameter> = #1 (= 0.750 Hole diam)
#<final-depth> = #2 (= 0.120 Taper Depth)
#<doc> = #3 (= 0.025 Depth of Cut)
#<angle> = #4 (= 45 Angle of Taper)
#<z-start> = #5 (= 0.000 Z Start)
#<feed> = #6 (= 2 Feed Rate)
#<tool> = #7 (= 1 Tool Number)
#<max-rpm> = #8 (= 2000 Max RPM)
#<sfm> = #9 (= 100 SFM)
#<coolant> = #10 (= 8 Flood=8, Off=9)

G7 G18 G40 G54 F#<feed>
G96 D#<max-rpm> S#<sfm>
T#<tool> M6 G43
G42 (start cutter comp)
M3 M#<coolant>
#<current-depth> = 0
o100 while [#<current-depth> LT #<final-depth>]
o110 if [[#<current-depth> + #<doc>]LT #<final-depth>]
#<current-depth> = [#<current-depth> + #<doc>]
o110 else
#<current-depth> = #<final-depth>
o110 endif
#<current-x> = [#<diameter> + [#<current-depth> * 2]]
G0 X#<current-x> Z[#<z-start> + .01]
G1 Z[#<z-start>]
;G1 X#<diameter> Z[#<z-start> + [#<current-depth> * TAN[90 - #<angle>]]]
G1 X#<diameter> Z[#<z-start> + [#<current-depth> * TAN[90 + #<angle>]]]
G1 X[#<diameter> - 0.01]
G0 Z[#<z-start> + .01]
o100 endwhile

M5 M9
G0 Z[#<z-start> + .1]
G40 G97
;G53 G0 X0.000 Z0.000

o<taper-ida> endsub

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05 Jan 2013 20:46 #28398 by BigJohnT
Replied by BigJohnT on topic Re:Lathe ID taper
Morning Rick,

Yep, it does look like that now :) with one exception

(info: Taper ID, multi-pass)

John

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05 Jan 2013 21:03 #28399 by Rick G
Replied by Rick G on topic Re:Lathe ID taper
John,

That is pretty cool, I will add that to my sub directory if I need to work from the angle of the taper instead of the dimensions.

As I park my lathe at the tailstock end I need to comment out the ending G53 G0 move to avoid surprises.

Rick G

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