Cincinnati Arrow 500 (Acramatic 2100 control) Rigid Tapping Issue – need help please.

kevman58 · Apr 25, 2019

First time using rigid tapping with this machine and the part is pulling up in the vise.
Here’s the code I’m using:

N1 T47 M6
N2(MSG,5/16-18 UNC TAP)
N3 G0 X1.245 Y-.719 S305 M3
N4 Z.1 M8
N5 G84.1 G95 Z-.78 R0 S305 F.0557
N6 X0 Y1.438
N7 X-1.245 Y-.719
N8 G0 G94 Z1. M9
N9 M5
N10 M2

The thread pitch is .05555555555555 but the post processor is outputting “F.0557”. I tried rounding to “F.0556” with no change in results.
Any suggestions are welcome.

Thanks,
Kevin

Rod Man · Apr 25, 2019

I always tap in G-94 mode. don't know if that would make a difference or not.
G84.1 G94 Z-.78 R0.0 S305 F16.994
If that doesn't help you may need to do a synchronizing procedure on the control.

Dale

sinha · Apr 25, 2019

kevman58 said:
First time using rigid tapping with this machine and the part is pulling up in the vise.
Here’s the code I’m using:

N1 T47 M6
N2(MSG,5/16-18 UNC TAP)
N3 G0 X1.245 Y-.719 S305 M3
N4 Z.1 M8
N5 G84.1 G95 Z-.78 R0 S305 F.0557
N6 X0 Y1.438
N7 X-1.245 Y-.719
N8 G0 G94 Z1. M9
N9 M5
N10 M2

The thread pitch is .05555555555555 but the post processor is outputting “F.0557”. I tried rounding to “F.0556” with no change in results.
Any suggestions are welcome.

Thanks,
Kevin

G95 is fine. You will not need to calculate feedrate.
Not sure about your control, but Fanuc allows up to 6 digits after decimal for pitch (feedrate with G95), irrespective of increment system being used. You may try the same. Might help.

kevman58 · May 6, 2019

Still have issues

Thanks for the suggestions.

I tried both suggestions above but the threads are still not tapped clean. A cap screw will not thread in without excessive force and without damaging the screw.

I did notice the following parameter:

G84 Dwell Time G84_DWELL +0.50

Since the parameter is G84 and not G84.1 I'm assuming it has no affect on rigid tapping, but not sure.

Dale mentioned a synchronizing procedure on the control, I skimmed thru the manuals and can't find any information on this procedure. Can anyone provide me with instructions on the procedure?

Thanks,
Kevin

Rod Man · May 6, 2019

When I get back to my shop tonight I will scan and send the procedure to you.

Another option is to use a floating tap holder like this. CAT40 Floating Tap Tool Holders - MariTool

Dale

Rod Man · May 6, 2019

PM Sent to you

masheenist · May 6, 2019

Here's how I calculate "F" value.
Thread pitch multiplied by RPM gives feed rate.
In your program----(0.0555 x 305 = 16.9444)

lumley32 · May 7, 2019

is the pitch set correctly in the tool library on the machine? personally, I always set taps to 1 flute but not sure if it makes any odds.
for what it's worth this is how I would code the tapping (it's in metric) generated by the RAP on one of my A2100's

G84.1 G97 G95 G90 X0 Y0 Z19.812 R0 W50 J2 P0 K50 S305 F1.4111 M3 M8
G0

g-coder05 · May 7, 2019

lumley32 said:
is the pitch set correctly in the tool library on the machine? personally, I always set taps to 1 flute but not sure if it makes any odds.
for what it's worth this is how I would code the tapping (it's in metric) generated by the RAP on one of my A2100's

G84.1 G97 G95 G90 X0 Y0 Z19.812 R0 W50 J2 P0 K50 S305 F1.4111 M3 M8
G0

this is a great example but I found the 2100 likes the feed to be in division format
G84.1 G97 G95 G90 X0 Y0 Z19.812 R0 W50 J2 P0 K50 S305 F1/18 M3 M8

the 2100 was so powerful it could make the calculations many more decimal places than needed.

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Cincinnati Arrow 500 (Acramatic 2100 control) Rigid Tapping Issue – need help please.

kevman58

Plastic

Rod Man

Aluminum

sinha

Titanium

kevman58

Plastic

Rod Man

Aluminum

Rod Man

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masheenist

Plastic

lumley32

Cast Iron

g-coder05

Titanium

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