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91
Announcements & Issues / Re: And we're back!!!!
« Last post by Stilldrillin on January 12, 2018, 04:47:40 PM »
It's good to be back, again.

Seems, my Norvin avatar, has not made it.  :(

Have to make do, with an old one. Until that pic shows up, again.....  :scratch:
92
CNC / Re: DDCSV1.1 4 Axis controller
« Last post by lordprimoz on January 12, 2018, 01:52:19 PM »
Hi Guys,

when running gcode on my machine I have this really werid issue where there is a significant deviation in the actual position(as well as the position it shows on the display) and the position it should be according to the gcode.

im trying to mill a vacuumtable, which is basically a milling grid pattern where i step down 0.1mm for each level.
Fusion360 generated the gcode for this project.
 
I noticed that (it seems to be in all axes) the z-axis has this weird difference. for example: the gcode tells the machine it should go to -0.8mm on the Z-axis, but it actually only goes down 0.774mm. After moving up and to a new spot it moves moves down again. This time its also different from the previous value. This might be something i would expect from (failing?)backlash settings, but these are all disabled and set to 0.

So essentially the machine starts and moves to a xy coordinate, then it moves down (gcode Z-0.8) to -0.7xx. When it moves up again to its safe position and comes back down the z-depth is no longer the same as previous, even though this depth was already wrong.

When telling the controller to move to a certain z-heigth from the display itsself it does indeed move to exactly that position....


Anyone got any ideas what is causing this?
93
Announcements & Issues / Re: And we're back!!!!
« Last post by mattinker on January 12, 2018, 12:16:50 AM »
Thanks Eric,

I'm back!

Regards, Matthew
94
Announcements & Issues / Re: And we're back!!!!
« Last post by vintageandclassicrepairs on January 11, 2018, 02:26:46 PM »
Hi Eric,
Thank You now I'm sorted, I had to sign in to the site again, but it seems to be ok now
Firefox would not let me sign in Yesterday,
it blocked my saved password that of course I cannot remember,
If I find any more problems I will be in touch

Regards
John
95
Neat Stuff / Re: A bit of fun drilling holes
« Last post by Nicolas Hulme on January 11, 2018, 02:24:05 PM »
I think the bit in the video was at least 1/4" diameter, thermal mass and conductivity might make the difference.
96
Project Logs / Re: Threading carbide insert holder
« Last post by eskoilola on January 10, 2018, 11:13:07 PM »
What an odd thing. I bought some center drills from Frankfurt flea market and this is one of them. First I thought that it was dull - no it was not. Luckily I can run the lathe backwards.


Yet another tool. I think everyone has made at least one of these.


Still another threading tool. This is for internal threads. It uses the external threading insert so it must be ran backwards. I also learned the hard way that this material is really hard when hardened. It was really hard to get 0.5 mm from the diameter after hardening. Hard enough - or enough hard. Hardly enough hard wor(d/k)ing......
97
Announcements & Issues / Re: And we're back!!!!
« Last post by Brass_Machine on January 10, 2018, 06:15:37 PM »
Hi John,

I think I fixed it. Let me know.

Eric
98
CNC / Re: DDCSV1.1 4 Axis controller
« Last post by WeldingRod on January 10, 2018, 05:42:00 PM »
Back to Backlash Basics.

Has anyone used this on the  version 1.1 controller and the 16-04-17 software?

I know I have about 0.1 mm backlash in X and Y

If I run this code

G17 G21 G90 G94 G54
(^Safe Block^)
F 2.
S 10.
G1 X-1.  Y-1.
G1 X0.
Y0.
G1 X10.
Y10.
G1 X0.
Y0.
M30


A quick question on the Gcode above: is the F 2 line the correct syntax?  Or should it be G1 F2, or G1 F 2?  :scratch:
99
Announcements & Issues / Re: And we're back!!!!
« Last post by vintageandclassicrepairs on January 10, 2018, 05:37:37 PM »
Hi Eric,
I normally use Firefox as my chosen browser,
However now it comes up with a message that the site is not secure
clicking on the "Learn More" I get this page
https://support.mozilla.org/en-US/kb/insecure-password-warning-firefox?as=u&utm_source=inproduct

I can access the site as normal from Chrome ?
I have the "Recent unread topics" on my bookmarks as the go to page on both browsers

I hope you can sort this
John
100
CNC / Re: DDCSV1.1 4 Axis controller
« Last post by WeldingRod on January 10, 2018, 04:37:38 PM »
Progress!   :thumbup: It turns out that the parameter:
5    Min. log. radius in 4-axis mode
Translates to: divide maximum feed rate (and probably acceleration) by 360 * pi* this number to get degrees per minute on the rotary axis.  FYI, I'm guessing on the constants.  What I actually did is test at a log radius of 5mm, 55mm, and 555mm.  5mm was so fast the motor lost steps unless I set FRO down to 20%.  55mm was slow enough that 100% FRO didn't lose steps.  555mm was even slower.

HOWEVER, I'm pretty sure it doesn't pay any attention to the F command WRT the rotary axis, at least alone.  I need to play with some coordinated motions more.
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