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Author Topic: Setting the feed speed for the tool  (Read 2518 times)

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Setting the feed speed for the tool
« on: September 16, 2013, 04:41:47 PM »
Hi

When turning in metal i would llike the tool to not move so fast against the workpiece.
how do i set this speed.

Børge

Offline Hood

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Re: Setting the feed speed for the tool
« Reply #1 on: September 16, 2013, 05:48:31 PM »
In your G Code you set the feed with the F word, for example G1 X100 F100 would move X from its current location to 100 units at a feedrate of 100 units per minute (assuming you are using G94, feed per minute)
If it is a lathe then it is normal to programme in feed per rev, G95, so your feed would be much smaller, for example a roughing feedrate I would normally use between F0.25 to F0.35. BTW that is metric units I use so if it was imperial units your feed per rev would be 25.4 times less.

Hood
Re: Setting the feed speed for the tool
« Reply #2 on: September 16, 2013, 06:14:29 PM »
Thanks Hood
Its a lathe.
If i got it right i will type: G1 X100 F0.25

Børge

Offline Hood

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Re: Setting the feed speed for the tool
« Reply #3 on: September 17, 2013, 03:17:53 AM »
Yes, thats correct, well assuming 3 things of course.
1. You are in Feed per Rev mode (G95)
2. You have spindle speed feedback to Mach so that it knows the RPM
3. You are using metric

Hood
Re: Setting the feed speed for the tool
« Reply #4 on: September 17, 2013, 12:12:04 PM »
Hi Hood

Its a miniature lathe, it doesnt have spindle speed feedback...
I am using metric.

Does this mean it wont work...

Børge
Re: Setting the feed speed for the tool
« Reply #5 on: September 17, 2013, 04:02:53 PM »
Hi

I rewrote the code and made it work :)
I did put in the speeds manually, and it worked just fine.
Its doable as long as the code isnt very long.

Børge

Code: [Select]
(File pullert25.tap )
(Monday, September 16, 2013)
G90G80G49G94
G90.1
G0 Z-0.0011 X0.4625
M3
F4.000 G1 Z0.0032 X2.1014
G1 Z3.8912 X2.1055   
G0 Z3.8955 G1 X1.9090 F0.5
F4 G1 Z-0.0011 X1.9090
G0 Z0.0032 G1 X1.7711 F0.5
F4 G1 Z3.8955 X1.7711
G0 Z3.8912 G1 X1.6163 F0.5
F4 G1 Z-0.0052 X1.6163
G0 Z-0.0011 G1 X1.4658 F0.5
F4 G1 Z3.8996 X1.4658
G0 Z3.8996 G1 X1.3320 F0.5
F4 G1 Z-0.0011 X1.3320
G0 Z0.0032 G1 X1.1774 F0.5
F4 G1 Z3.8996 X1.1774
G0 Z3.8996 G1 X1.0478 F0.5
F4 G1 Z-0.0011 X1.0478
G0 Z-0.0011 G1 X0.9140 F0.5
F4 G1 Z0.9989 X0.9140
G0 Z0.9989 G1 X0.7970 F0.5
F4 G1 Z-0.0011 X0.7970
G1 Z0.9989 G1 X0.7050 F0.5
F4 G0 Z0.9989 X0.5963
G1 Z-0.0011 G1 X0.5963 F0.5
F4 G0 Z0.0022 G1 X0.4838
M3
G4 P1 G1 Z-0.0011 G1 X-0.0181
G0 Z0.0022 G1 X0.4838 F0.5
F14 G4 P1 G1 Z0.9989 X0.4838
G1 Z0.9989 G1 X0.9182 F0.5
F14 G1 Z3.8996 X0.9182
G1 Z3.8996 G1 X2.1117 F0.5
G4 P1 G1 Z5.6656 X2.1117
(G0 X1.0000)
M5M30

Offline Hood

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Re: Setting the feed speed for the tool
« Reply #6 on: September 17, 2013, 04:09:11 PM »
If you do not have spindle feedback then you need to make sure you do not have the Use Spindle Feedback in Sync option chosen on General Config page. If it is chosen and you are using G95 then the axis will move extremely slowly as it is not seeing any spindle speed. If however you do not have that option chosen then Mach will just assume the spindle is at the commanded speed and will feed at the rate set in your code.
Hood