OSP-700M spindle index in G84/G284 rigid tap

[annoying]

I searched a little on here and didn't see anything. I hate to ask questions, but.....

Have an old cadet mate VMC with OSP-700M. I have some pieces I wish to thread and want to time the threads. I looked back at the book to find that there is an option with rigid tapping to index the spindle angle. "E" is the address for this starting angle at R point.

When I try to run it, threads in, starts out, but before it can return to the R point, the machine alarms out. I get a 1710 alarm A... said something about spindle orientation not completed or something like that. Before seeing that there was the ability to index the spindle with the G284, I tried to use M19, then straight to G284. Of course I got the same alarm doing it that way.

Has anyone ran into such problem? Or know if there is a fix?

I did notice when addressing "E" in the G284, the spindle orients to the proper angle, then sorta kicks over a little, and then proceeds to run through the tapping cycle, until it is almost backed out and then alarms.

When removing the "E", it obviously runs fine

Is there maybe a fault in the G284 fixed cycle? Maybe perhaps anything in parameters not set allowing this?

It just seems the cycle is not ending the spindle orientation before starting with tapping, therefore the reason for the alarm.

Any thoughts or help would be much appreciated.

[Superman]

We don't use an "E" address in the rigid tapping cycle
- also no need to start the spindle as it is part of the cycle ( G84 & G284 forces the CW rotation )
- we set G95 on or before the tapping line to set feed per rev, & set the F to actual pitch,
- remember to set back to G94 before unloading the tapping tool

[OkumaWiz]

Maybe not much help, but I have 3 questions...

Have you tried the M19 and then the M284 WITHOUT the E command?

Is your parameter set to retract at 200% or at !00%. It may affect the retract move if set to 200%.

There are a bunch of parameters related to spindle orientation, but can you be running at an rpm and then stop with M19 and no alarms?

Let us know,

[annoying]

After running things again, and watching the block data, it appears that while the machine is running the tapping cycle, the M19 remains. This is when using the G284 with no seperate commands. It apparently uses M19 for the initial orientation. As far as I can tell, it controls the spindle as a seperate axis, so there is no M3 generated which would otherwise cancel the M19.

So, is there a way to allow more time for orientation? I'm thinking this may allow time to complete the cycle before it alarms. Also, is there any way to look at the fixed cycles and maybe edit them?

[Superman]

When removing the "E", it obviously runs fine

so,,,, why the do you need to use the E address ?

what explanation does the book have for E ? ( can't find anything in ours. )
the rigid tapping cycle is timed to the spindle, so why is the orientation needed ??
( it's just another source of time wasting if you've got a lot of holes to do )

[annoying]

so,,,, why the do you need to use the E address ?

Well...... Just because. Actually, I'm trying to cut a multi-start thread. Something that no one else wants to mess with. A cnc lathe would work better, but, I do not have.

After toying, keeping the tapping cycle short, it runs okay. So, does anyone know if there is a parameter that a guy can change to give the spindle orientation more time before alarming out? That is kinda what is comes down to in order to make it work out better

[Superman]

Well...... Just because. Actually, I'm trying to cut a multi-start thread. Something that no one else wants to mess with. A cnc lathe would work better, but, I do not have.

With a Tap ??? You do realise that this is not normal practice, do you not agree ??
- most ( normal people ) would use a threadmill cycle ( but who's normal ?)

After toying, keeping the tapping cycle short, it runs okay. So, does anyone know if there is a parameter that a guy can change to give the spindle orientation more time before alarming out? That is kinda what is comes down to in order to make it work out better

Why not look at it from a different angle
F'-off the E parameter & start the 2nd cycle a 1/2 pitch higher for a 2 start thread

[annoying]

With a Tap ??? You do realise that this is not normal practice, do you not agree ??
- most ( normal people ) would use a threadmill cycle ( but who's normal ?)



Why not look at it from a different angle
F'-off the E parameter & start the 2nd cycle a 1/2 pitch higher for a 2 start thread

Well, gee... I didn't expect to get beat-up over it. Though I may not seem "normal" to some standards, I am far from wack. And... not absent minded.

To get right to it, original question was asking about the E address in the rigid tapping cycle. If there was any knowledge of a fix for the problem I was having.

No, I am not pushing a common tap. I have milled threads before, but not possible with this. It's an 8 start thread with a rather long pitch. Special made tool. And, of course, timing is critical.

I've got a work-around to get me by. It is better of done on a lathe, but I only have a manual lathe, and far from capable of the thread pitch. Hope to be able to squeeze a cnc lathe in the budget soon, till then, I do what I can. My mills do play "lathe" once in a while.

In the end, I could have done my work-around without bugging you folks here, but thought I'd check first. I like when things work the way they are suppose to. So, if'n I do get the alarming problem resolved, I will post the solution here. But, then again, it may not be much use as I am probably the only fool trying to use the spindle index.

[Superman]

Well, gee... I didn't expect to get beat-up over it. Though I may not seem "normal" to some standards, I am far from wack. And... not absent minded.

In the end, I could have done my work-around without bugging you folks here, but thought I'd check first. I like when things work the way they are suppose to. So, if'n I do get the alarming problem resolved, I will post the solution here. But, then again, it may not be much use as I am probably the only fool trying to use the spindle index.

No, I'm not having a go... reading the initial threads didn't tell the full story. And so, there is more the 1 way to skin a cat. ( I'm a programmer too....so, an open mind is always needed, an idea from left-field may be just the ticket )( re: the comment about "Who's normal" )

Your last post fills in a lot of missing info....
Is there no way of using a threadmill with the correct pitch & thread form, but program it to using the lead ?? ( all depends on the lead angle, I suppose )

Our books have no mention of an E address, & as it was giving problems, I offered a different solution ( - by srarting each cycle at a different R plane without having to orientate to each of the 45° positions before tapping )
(ie. lead / # of starts = the incremental distance between each R plane , tool is always orientated to 0° )