tapping

[Elad]

I can't save the parameters for tapping!!

after clicking ok,the parameters (feed rate & spindle speed are gone!)

Will they fix this bug??

(I'm using v8.1)

Thanks,

Elad.

[This message has been edited by elad (edited 02-25-2001).]

[gcode]

elad,

Make sure you are using a tap (tool type) and have defined a thread pitch in your tool definition. If you leave

that field blank, you will get a zero feed rate and zero spindle speed

[Elad]

I did write the thread and tap,but when i

click ok,the feed rate "jumps" and become

somthing else (the spindle speed stays the

same).

I didn't have that problem in v.8, and i have it only in v8.1 (i use the same post).

 

[CycleTimeCharles]

Looks like the calculation only works in one direction.

If you enter the feedrate the RPM come out right.

If you enter the RPM the feed goes to the default for that tool.

[Elad]

Yes,

It works only one way,but if you'll type the

feed rate and you'll get the spindle speed,

it seems to look ok, but after clicking ok,

it's gone.check the NC file and you'll see

the problem.

[Luther_Heggs]

Okay - you lost me. Are you talking about the spindle speed and feed in the operation parameters OR the spindle speed and feed in the tool definition?

In either case (in inch units), mine works fine. The spindle speed and feed seem to be tied together when assigning a tapping tool to your operation. Change the spindle speed and the feed changes. Change the feed and the spindle speed changes. Both are being calculated to the pitch of the thread. PITCH = 1.00 / number of threads. FEED = Pitch X spindle speed. RPM = Feed / pitch.

In METRIC, the THREAD value in the tool defintion seems to be the pitch value in millimeters (the distance between the threads). It's not the # of thread per inch. It should read "Pitch" if it's a metric tool.

Maybe this is where you're going wrong?

 

 

[Guest CNC Apps Guy 1]

Remember when tapping, spindle speed and feedrate are tied together. If you change one, the other will change because the formula is determined my the thread pitch. Just something to consider.

------------------

James Meyette

[gary dunn]

in metric, pitch X RPM = feedrate.

for instance, a 6mmX1 metric tap spinning

at 250mm per minute (roughly 9.8 inches per minute) would have a feedrate of 250mm

per minute becuase there is one thread per revolution. to save those vales, set up

your taps in the tool definition library.

we setup mine and they have never changed.

NCutils/ define tools / library