OK< Guys I really need your help, I am very frustrated with another recent issue and am totally confused as to what it could be. :? Again I am trying to design this planes for sale and this would make for an unhappy customer Once I get this plane in action ,tried and trued, you Phlatbrothers are more than welcome to the code file!!!
So, Here is what is happening... I have recently designed an F3P mono wing plane and cut three separate files. Now what I have discovered is that in the x axis all my cuts seem to be enlarging exponentially to where this particular plane is 3/8" longer than the actual design. Also the tabs become offset from the vertical and horizontal fuse. Now the weird thing is they are not consistent and the vertical fuse is longer than the horizontal by 1/8" total. I am trying to rule out mechanical slipping because the fuse would then be theoretically shorter not longer, and I calibrated the axis and it appears to be dead on.. its as if something is making this adjustment for me without my knowledge.
So do you think it could be an issue with the control board or within Mach3..... HMMmm!!
I would be very grateful if someone has had this issue to come through before I waste anymore 3mm depron!!

Thanks in advance my Friends!!
John Attached files

 

Thanks E-T, I am using t tabs set a 60% depth. Also close would be fine but this is way off. The funny thing is that both halves of the vertical fuse cut the same distance so Im pretty sure there is some formula of expo as it travels down the axis. I would like to try the acceleration but not sure how much to add!! Can you tell me your settings on the x axis when you get a chance!! Thank you again!!

John

 

Thanks Randy, but I did put a flat on the spindle/shaft during the build and when I checked it today there was no play or slop, also slipping would cause the fuse to be shorter as the hesitation would make the cuts short, correct?

John

 

Hi Shaun, again wouldnt this be slippage and ultimately cause a shorter length of cut not longer? But no I have not done the test because I had the 1/16" bit in and wanted to do a cut of this new bird!

John

Attached files

 

The wild thing is Randy all my cuts end up at the same start and stop points and all corners are perfect bevels perfect so it would seem if this was slippage it would not be exact in both directions hence end points would be off slightly... HMMM!!!

 

Good idea Randy, Maybe this has been my problem the whole time but now I am just getting picky as not to waste my depron LOL I cant try this now because my kids are sleeping... But you know it will be fired up tomorrow!!

John

 

Thanks E-T... Wow your bringing back memories.. Mark discovered that when I was having problems back when I got mine running, it works awesome!!! Curves sound smooth!!

John

 

OK guys, I just re calibrated my x axes and found that over a 36" span it was running 7/16" or .4375 out of sync.... I re ran my test file and bamm, right on the money. I originally ran my calibration based on 15" span and it was around 1/16" off right after it was built. I checked for any mechanical issues via loose pully etc.. and found it to be very tight with no backlash of any sort. So, my question to you guys is, when calibrating and axes at any length shouldn't it be adjusting the recalibration exponentially? I dont know why it was so far out of sync. I will do another cut on a plane and see if this was the ticket.
Thanks for all your input and to Randy for pointing out a few test procedures to get this right!!

John