This bugs me.

Flycut · February 11, 2022, 07:43 AM

I've been bothered by this for too long and it needs end here.
Why have G81 when G82 does exactly the same thing and more?

TIA

mayday · February 11, 2022, 07:47 AM

best I can say maybe I'm wrong
back in the stone age G81 was the only drill cycle written besides pulling down on the spindle handle

CNCAppsJames · February 11, 2022, 07:58 AM

Because they are different cycles. Sometimes you just want the straight stuff with no frills.

Flycut · February 11, 2022, 08:00 AM

Quote from: CNCAppsJames on February 11, 2022, 07:58 AMBecause they are different cycles. Sometimes you just want the straight stuff with no frills.

And if you omit the P from G82 you get just that.

CNCAppsJames · February 11, 2022, 08:11 AM

QuoteAnd if you omit the P from G82 you get just that.

Or... post out G81 and don't omit anything.

Flycut · February 11, 2022, 08:13 AM

neurosis · February 11, 2022, 09:02 AM

They probably created a G81 and someone said "fuck - this doesn't work for shit for c-sinking. G82 it is".

Tim Johnson · February 11, 2022, 09:09 AM

QuoteI've been bothered by this for too long and it needs end here.
Why have G81 when G82 does exactly the same thing and more?

TIA

Does G82 without the P work?

crazy^millman · February 11, 2022, 10:03 AM

G81 will not allow for a Dwell and G82 will allow for a dwell on most machines.

CNCAppsJames · February 11, 2022, 10:12 AM

BITD, machine memory was a precious resource. EVERY character mattered. Even spaces took up memory.

Today that really isn't the case so from the comfort of our 1GB+ program storage spaces we ask ourselves why something is.

Well, in a nutshell, G81 exists today because backwards compatibility of canned cycles matter.

Flycut · February 11, 2022, 10:55 AM

QuoteDoes G82 without the P work?

It does on my Haas

DUM1 · February 11, 2022, 11:15 AM

bugs me more

mayday · February 11, 2022, 12:21 PM

Quote from: CNCAppsJames on February 11, 2022, 10:12 AMEven spaces took up memory

I have no memory of that
extra paper tape and holes, oops wait those where to 2 axis machines. G81,G82 was all by hand, sometimes both hands

Incogneeto · February 11, 2022, 03:15 PM

I use G82 whenever I countersink with my Makita Hand drill.

CNCAppsJames · February 11, 2022, 06:01 PM

QuoteI have no memory of that
extra paper tape and holes, oops wait those where to 2 axis machines. G81,G82 was all by hand, sometimes both hands

Yeah, I worked in a shop that had Kitamura Drilling and Tapping Centers with 6M controls... I think we had 16k memory..Anyway, after posting and editing code, we had to remove the spaces in the program before sending in order to fit. Oddly, onceninnthe control, they would regain the spaces but it would not consume memory for doing so. Perhaps just a display thing.

That concludes today's history lesson by. O.A.F.