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Messages - RICH

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4781
LazyTurn / Re: LazyTurn
« on: March 14, 2010, 11:45:02 AM »
ART,
How is the implementation of arc coding doing? Any progress?
RICH

4782
FAQs / Re: Cutting outside profile problem.
« on: March 13, 2010, 09:17:47 AM »
Rob,
All you need to do is create an outside offset in LC. Unenable or delete the original profile and then select the layer with offset , go to the layer tab and define the tooling cut. No need to use another program......
All in the manual .....
RICH

4783
FAQs / Re: Cutting outside profile problem.
« on: March 12, 2010, 10:31:43 PM »
What program or wizard are you using to generate the code?

You could tell the program that the cutter is smaller by some amount and thus when you use a cutter larger than what the program offset was based on
your part size would turn out undersized if that is what you are meaning.
RICH

4784
LazyTurn / Re: LazyTurn
« on: March 12, 2010, 10:25:54 PM »
ART,
Just posting thoughts on the matter and don't expect ya to do anything unless it really makes to do so.
The tool table be can modified to keep original tools, copy the same tools with a different number and modified offset, etc.
no one way works for all the varity that can exist or how the machining will be done. Simpler profiles with min number of tools used
can provide a level of automation.........

RICH

4785
LazyTurn / Re: LazyTurn
« on: March 12, 2010, 03:25:21 PM »
ART,
Talked to Graham a little about a work around.

A G52 could be used to shift the part zero within the current work ofset by some amount.
The G52 requires an active work offset. If home is set / it's at x & z =0 ( you have the offset in place as the
 user defines the part location from home via an offset).

So you use a G52 before the two G0  moves and then cancel the G52 after the moves. Thus if the tool table is
based on the cutting tip, the tool would actualy end up being aligned as if it was based on centers post the machine
move from home..

So a few rules on use  of the G52:  ???
- The tool offsets in the tool table are based on the tool tip cutting point.
- There is a work offset from home ( home used here as the tool  tip cutting point to part x & Z =0)

LazyTurn Rules:  ???
1. If the same tool radius is used for all passes then only need to implement the G52 one time
 and home posting is only required once. 
2.A G52 is always required on the first pass, and a G52 is always required if the tool radius changes
from the previuos one.

G52 EXAMPLE FOR X TOOL ALIGNMENT "only":
TOOL RADIUS =.010"

G52 X-.010 ( provides for adding the radius to the actuall length traveled in the G0x....move) 
G0 Z .......
G0 X........
G52 X0.0  ( cancels the G52 and returns to work offset)
G.......no difference from here as the code is still precompensted including the clearance.

I think i got it right......... :P
I guess there would need to be another posting option / options.
Will ceratinly be confusing to a novice user.

RICH

4786
LazyTurn / Re: LazyTurn
« on: March 12, 2010, 03:23:24 PM »
Dennis,
I haven't  looked at the posted code that much, but are you saying
that for the same Lt defined tools and settings for the rough and finish passes that are used,
the posted code varies?

I know that varying the rough and finish settings for the same tools will provide different results ( would be expected)
and in some of those cases it does look like a different approach ( in fact,   you would not want to do / post code from it ).
You need to try something different.

As to tool set up ....yep....it can get confusing, and for a one only may take more time than machining it.  ???
Waite till you read my next posting.......... ::)

RICH

4787
LazyCam (Beta) / Re: Cutting outside profile
« on: March 11, 2010, 04:49:43 PM »
Bob,
Whatever works for you and satisfies what you want to do is what matters!
There is no one way or solution to anything. Have fun........ ;)
RICH

4788
LazyTurn / Re: LazyTurn
« on: March 11, 2010, 04:37:24 PM »
Dennis,
My assumption is that the user would always start from a homed position. Homed in the sense that the carriage position is away
from the part far enough that he can change to any tool. If you have home switches you are at 0,0 automaticaly, if you don't have them
then you set home away from the part. Still need to touch off  to define the part location whether you do a skim cut or touch off with the master tool.  I haven't used additional offsets, but, maybe some of that will come into play now.

If you use the same tool for say rough and finish passes then all is rather simple. If you don't, it gets more complicated. Put the tool on a goofy rotated angle as the second tool required for a pass, and you have lost position because you can't loosen a tool post and maintain position to say a master tool. So you will need to touch off ...again....to some reference. So there is an accuracy problem associated the basic tool setup and then there is also how accurate your lathe system is. Consider using a tool with with a radius different than what you created the pass with in Lt ( human error and it will happen).If the tool post is bolted to a cross slide which rotates, you still won't return the cross slide exactly back to where it was.
Somewhat all of the above is nothing new.
 
You have a choice before posting if you want to post the G28 & M0. You can work any way you want.

From a drawing / design point of view you would not create a profile requiring a non standard tool insert these days  unless really necessary as it drives up cost.

Just some thoughts,
RICH


4789
LazyTurn / Re: LazyTurn
« on: March 11, 2010, 03:44:13 PM »
ART,
Pre compensated code.....done deal, no problem.

What do I suggest as a solution?
Don't have a "universal / single solution" yet. Don't think there is one......I just need to take a good look at the generated code and try to anticipate
what problems a user will have in both setup of his lathe and using his tools. That's what Appendix "F" Mach3 Turn is all about.
There are a wide range of situations. IE; Most users will be doing a one of a kind profile, maybe want to repeat the profile,
standard tooling / non-standard tooling,  probably a quick change tool holder ( which has it's owne inherent limitations),
no / modified/or original created  tool table, a indexable rotary changer ( unlikely for the average user ), can or can't touch off to the profile,
 how closely somebody wants to turn to the drawn profile,...etc.

It comes down to tool setup, level automatation, and  degree of accuracy the user wants to accomplish with the lathe system he has to machine
the profile based on the precompensated code.

So i am taking an approach in the write up, and will assume some things to make  tool set up managable.
The writeup will cover basics of setting up the lathe, a how to on tool table setup, creating the offset for home,  and relate all that stuff to
whatever needs to be done to use LT's generated code to turn a piece. Ya just need to go through it all and see where the practical problems
arise and see if there is something "simple" that can be added which makes tool setup less problematic and usefull.

A good example was the option of having the G28 and M0 added to the code. Also the M40 & M90 always posting.

Need to play around some more  and will post if i get any ideas on it. There are a whole lot of more advanced users out there than myself.

RICH  

4790
General Mach Discussion / Re: wizards
« on: March 11, 2010, 09:11:37 AM »
Make the mechanical adjustments as best you can and then use  backlash comp . It works quite well and shouldn't slow things much
since all it does it take out the non movement on change of direction.
RICH

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