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Messages - DaOne

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171
General Mach Discussion / Re: Mach 3 turn constant sfm?
« on: December 08, 2010, 09:41:53 PM »
When I use this code CSS works fine meaning as the diameter decreases spindle speed increases. What is not working is the G95 or constant mm/rev feed rate.  If I assign F=.2mm/rev this feed rate only takes place at the start of the cut when the RPM is still 1000RPM. As the RPM increases the feed rate in mm/rev decreases.  Has anyone had experience with this behavior? My observation is that RPM x F(mm/rev) remains a constant value which suggests to me that the feed  is remaing constant in mm/min and not in mm/rev as it should having set G95.

I ran into this a couple of days back. It seams as if mach had a mind of its own. The feeds were almost rapids. CSS still worked but the feeds were way off. It required restarting to solve the issue and then it did it again after a few passes. Good thing for me I was cutting air. I feel there is a bug. I haven't had any more time to test if it occurs only with CSS and feed per rev on the same program. Something tells me its gonna be a long time before it gets fixed if there is actually a bug.

172
Share Your GCode / Re: Post for Mach3
« on: December 04, 2010, 05:03:18 PM »
What version of Mastercam? X - X5, lathe or mill post? MR2 doesn't tell me much. Thats just the maintenance release.  I have been working on a lathe post for X5

173
Works in progress / Re: 3 PAGE LATHE SCREEN - WIZARD ADDITIONS
« on: November 30, 2010, 01:28:27 PM »
Dan I just tried this is Diameter mode and the code outputted appears fine. I would love to fix the issue if I could find one. Please post the code you outputted from the wizard while in diameter mode that is diving into the stock.

174
Works in progress / Re: 3 PAGE LATHE SCREEN - WIZARD ADDITIONS
« on: November 30, 2010, 01:15:17 PM »
Please explain what you mean by "The Z start and end are still swapped." Are you talking about where the dros are located on the layout? They work fine for me in the calculations.  I will take a look at diameter mode.

175
Works in progress / Re: 3 PAGE LATHE SCREEN - WIZARD ADDITIONS
« on: November 29, 2010, 03:36:02 PM »
Hi Wes,

I am in diameter. Are you saying that it will always do moves of half a circle? If so then the tool path was misleading - I saw it doing half circles and thought I will get the half circle in the part, but it appears to me now that part of the move will cut air. Will try to cut some material and see how it works.

Dan

Yes it cuts allot of air. In order to do it any other way would require allot more programming. Most of the wizards are very inefficient. The radius one I used cut mostly air as well until the final passes. The nice part is these are more less for quick one off parts not production runs so time doesn't matter much as long as the end result is the same. I made some chips with it today on a few test parts and it worked flawlessly.

176
Works in progress / Re: 3 PAGE LATHE SCREEN - WIZARD ADDITIONS
« on: November 28, 2010, 10:22:31 PM »
Just tried to cut air. The tool would dive right into the stock, following the arc. Needs a few roughing passes based on the X start and final X. May be the rough passes should be G1 and only a few last passes would be G3.

The Z start and end are still swapped.

Also, the X start and X end don't seem to be defined correctly. X start should be the initial stock diameter. X end should be how deep you want the arc in the workpiece, i.e. not always would you want half a circle (this is what the current code keep doing).

Dan


Something isn't right. The way the code works is this. It takes the X Start + the Radius of the arc + the clearance. This becomes the X start point for the Arc. It determines how many cuts to make based off your roughing depth and finish depth. It will cut to the X end and then rapid to the X start + clearance then to the Z start + clearance.

Are you cutting in diameter or radius mode?

177
General Mach Discussion / Re: Mach 3 turn constant sfm?
« on: November 28, 2010, 04:54:02 AM »
Here are the ingredients for spindle control...

G48  "Sets the max RPM the spindle will turn (so you don't over speed your work /chuck)
G96  "Sets the mode for constant surface speed (CSS)"
G97  "Sets the mode for constant spindle speed (RPM)"
S  "This is the command to set the spindle speed. In CSS mode this is SFM. In RPM mode it is RPM (S after G48 is RPM)"
M3  "Turns the spindle on (clockwise rotation)"
M4  "Turns the spindle on (counterclockwise rotation)"
M5  "Turns the spindle off"

So lets say you want to use a front toolpost on a left hand spindle lathe for your code would look like this...

Variables for CSS mode: SFM=400, MaxRPM= 2000, Direction is clockwise.

G48 S2000
G96 S400 M3
M5

Or...
Variables for RPM mode: RPM= 2000, Direction is clockwise.

G97 S2000 M3
M5

Hope that helps.

Wes

178
Works in progress / Re: 3 PAGE LATHE SCREEN - WIZARD ADDITIONS
« on: November 28, 2010, 04:00:38 AM »
Here is the new file with those updates... It also fixes a couple issues I found in the last version. Let me know what you think.

179
Works in progress / Re: 3 PAGE LATHE SCREEN - WIZARD ADDITIONS
« on: November 28, 2010, 03:53:44 AM »
After checking some code... You are correct on the M6 on a lathe. I program mills quite a bit more than lathes and it is required on the mills. I will pull it out of the code. Give me a couple min and i will up a new version.

180
Works in progress / Re: 3 PAGE LATHE SCREEN - WIZARD ADDITIONS
« on: November 28, 2010, 03:48:55 AM »
Dan, what version of mach are you using? I am wondering if you need a "I0." added in the mix. Most interpreters treat a missing "I" as a "I0." I wish I could find more documentation on how mach uses specific gcodes. Arcs always seam to give the most issues.

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