Pimping the mini-lathe
16 Aug 2020 14:14 #178408
by RotarySMP
Replied by RotarySMP on topic Pimping the mini-lathe
Hi Rod,
Since Rod is from NZ's west island, he can be a little grumpy at times
At the start of this weeks nonsensical filming, I assumed LinuxCNC could cut a tapered thread with it's G76. Was kind of committed by the time Andy informed me that the code was never finished, and I had to switch to G33. Gven the number hours it took to write and debug this code, I could have probably learnt Fusion..
I have an ancient copy of FeatureCam, to make milling tool paths. Back when I I first converted the Minilathe years ago, it used turboCNC which had a pretty cool G77 canned cycle for facing and turning simple parts, which is really 90 of lathe work. I am going to install Andy's lathe macro's on the lathe, and NativeCam on the mill and see how far they get me. I have subscribed to Fusion, but and pretty experienced with Catia for complex jobs and Onshape for quick things, that I havent found the time to learn Fusion yet.
Mark
Well I heard you guys but the dude's comments made me stay up past midnight to watch that video. So you are all in trouble!
Since Rod is from NZ's west island, he can be a little grumpy at times
At the start of this weeks nonsensical filming, I assumed LinuxCNC could cut a tapered thread with it's G76. Was kind of committed by the time Andy informed me that the code was never finished, and I had to switch to G33. Gven the number hours it took to write and debug this code, I could have probably learnt Fusion..
;Weird thread
;Why? Because a CNC lathe can!
;Tapered 3 start RH thread 23/57"OD x Pi TPcm, 11/7 Chi long, with a 23/19e taper angle.
;Z0 is end of stock.
#<_pi> = 3.2654
#<_e> = 2.71828
#<_chi>= 30.3
#<_starts> = 3
#<_OD> = [23/57*25.4]
#<_Z_LeadIn> = [#<_pi>*4]
#<_Pitch> = [#<_pi>]
#<_ThreadDepth> = [#<_pi> /3 ]
#<_ThreadLength> =-[#<_chi>*11/7]
#<_TaperAngle> = [23/19*#<_e>]
#<_NumThreadPasses> = ROUND[#<_ThreadDepth>/0.1]
#<_SmallDia> = [#<_OD> - [SIN[#<_TaperAngle>*2]] *[#<_Z_LeadIn> + ABS[ #<_ThreadLength>]]]
#<_DiaChange> = [#<_OD> - #<_SmallDia>]
#<_NumCuttingPasses> = ROUND[#<_DiaChange>]
#<_feedrate> = 200
#<_Speed> = 300
#1 = 1 ; Index start passes
#2 = 1 ; Index threading passes
#3 = 1 ; Index cutting passes
O110 sub ;Cut taper
O110 while [#3 LE #<_NumCuttingPasses>]
G0 Z[#<_Z_LeadIn>]
X[#<_SmallDia> + [[#<_NumCuttingPasses> - #3] * [#<_DiaChange> / #<_NumCuttingPasses> ]]]
G01 Z[#<_ThreadLength>] X[#<_OD> + [[#<_NumCuttingPasses> - #3] * [#<_DiaChange> / #<_NumCuttingPasses> ]]] F#<_Feedrate>
G0 X[#<_OD> + #<_DiaChange>]
#3 = [#3 +1]
O110 Endwhile
O110 endsub
O111 sub ; Cut Thread
O100 while [#1 LE #<_starts>]
O101 while [#2 LE#<_NumThreadPasses>]
G0 Z[#<_Z_LeadIn> + [[#1 - 1] * [#<_Pitch>/#<_starts>]]]
X[#<_SmallDia> - [[#2]*[#<_ThreadDepth> / #<_NumThreadPasses> ]]]
G33 Z[#<_ThreadLength>] X[#<_OD> - [[#2 - 1] * [#<_ThreadDepth>/ #<_NumThreadPasses> ]]] K#<_Pitch>
G0 X[#<_OD> + #<_DiaChange>]
#2 = [#2 + 1]
O101 endwhile
M5
G4 P2
M3
G4 P2
#2 =1
#1 = [#1 +1]
#<_SmallDia> = [#<_SmallDia> - [SIN[#<_TaperAngle>]*[#1 -1] * [#<_Pitch>/#<_starts>]]]
O100 EndWhile
O111 endsub
;Main
G18 G21 G40 G49 G54 G80 G94 G90 G7
F#<_Feedrate> S#<_Speed>
M3
G4 P2
O110 call
M5
G4 P2
M3
O111 call
M9 M5
M2I have an ancient copy of FeatureCam, to make milling tool paths. Back when I I first converted the Minilathe years ago, it used turboCNC which had a pretty cool G77 canned cycle for facing and turning simple parts, which is really 90 of lathe work. I am going to install Andy's lathe macro's on the lathe, and NativeCam on the mill and see how far they get me. I have subscribed to Fusion, but and pretty experienced with Catia for complex jobs and Onshape for quick things, that I havent found the time to learn Fusion yet.
Mark
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