Messages

811

Show"N"Tell ( What you have made with your CNC machine.) / Re: My Clock

« on: November 10, 2009, 07:10:58 PM »

Hi Guys:

 Yup, 3:16 or so..

 Theres a weight box hanging down below, that weight is strung to a wooden pulley on a wooden ratchet.

Gears are pretty easy , deadbeat gear is a 30 tooth wheel with an 8 tooth pinion. That turns a 64 tooth with an 8 tooth pinion, and that turns a 60 tooth. ( that will now rotate once per minute with a 43" pendulum , so thats the minute hand).  On that shaft an 8 tooth drives a 24 tooth wheel with a 10 tooth pinion that driver a 30 tooth hour hand shaft.

  Thats about all you need really. Theres lots of web pages out there to show how escapements work..

Later.

Art

812

Show"N"Tell ( What you have made with your CNC machine.) / Re: My Clock

« on: November 10, 2009, 12:13:34 PM »

Hi Guys:

  Its not that hard. I kinda did it on the fly just making the gears and attaching them to a poplar board.
Theres a program called involute that can instanly give you cnc code for the gears, so I picked the number of
teeth I needed, and made up a bunch of gears. Then I attached them to a baord, maked the holes, copied that
to cad and designed a bunch of cutouts on the board.

  Designing the pallet for the escape wheel was the only part you need to study up on..

Anyone wants the Gcode I have most of it laying around for all the gears and such..

Art

813

Show"N"Tell ( What you have made with your CNC machine.) / My Clock

« on: November 10, 2009, 09:57:39 AM »

Hi Guys:

  I figured someone might like to see my clock.. soemthing I decided to try and ended up spending 3 weeks obsessing on. :-)

Art

814

General Mach Discussion / Re: Problems threading on the lathe

« on: November 05, 2009, 09:43:47 AM »

looks good Rich. I just sent the new code to Brian and its now in the next version of MAch3, should be out soon.
Multi-slot or TIMING input based threading will not be available till the advanced threading plugin is rewritten, but single point
shoudl be as good as what you got. Correction should in theory work for up to a 75% drop in speed during a thread.

Thx
Art

815

General Mach Discussion / Re: Problems threading on the lathe

« on: November 04, 2009, 03:29:16 PM »

Rich:

 Sounds good. We have posted even thge preliminary as "Rich's guide to Threading" in the Docs section.We'll update it as it goes, but its too valuable IMO to
let languish on the forum.   .

Art

816

General Mach Discussion / Re: Problems threading on the lathe

« on: November 04, 2009, 08:39:28 AM »

Rich:

  Amazing Job!! . I think Ill ask Brian and Scott to post that in the regular Docs section ofthe website , its the best Doc Ive seen on threading in particular.
I love those tread photo's in it. (Give me a calm comfort. :-)  )

Art

817

General Mach Discussion / Re: Problems threading on the lathe

« on: October 31, 2009, 02:12:54 PM »

>>"you do not stand alone in the valley of darkenness"

Christ, am I in a valley? Its so friggin dark I though I was in a closet. :-)

Art

818

General Mach Discussion / Re: Problems threading on the lathe

« on: October 31, 2009, 02:11:44 PM »

John:

 Let us know how your testing goes, I know your test lathe has a low torque issue, and the resuilts of hard steel vs AL will be interesting and show me how well correction is maintaining its
accuracy. The number crunching seems to show we shoudlo be able to expect a good thread even if the spindle slows to less than 25% of the start speed. ( Though how much effect on
the pitch from pitch to pitch woudl be interesting to see.
\

Art

819

General Mach Discussion / Re: Problems threading on the lathe

« on: October 30, 2009, 08:02:08 PM »

Rich:

  I guess my main comment is that if you arent a professional tester or engineer, you otta be. Great work!, as usual.

I guess we slayed the dragon. My sword, your weapon handling. I have to say of all the debug testing running over 7
years now, I have enjoyed this run most of all simply due to the excellent reports, great testing and solid logic you employ.
 I agree with all your comments. They show exactly why certain aberations occur and will be posted in the Docs section when
Brian returns.
   I wont claim we have it all done or figured, or that strange things wont happen, but with lack of eveidence to the contrary, Ill consider this solution to be
the one we will use.  I now see many of the issues as obvious and am embarrased I missed them all this time, but thats the nature of all tough bugs.
I'll see to it that all is incorporated into the next version of Mach3, and the driver will change to reflect what
we've done.

  I'll write up a report for the yahoo group to explain what we've doneas well. I think in future Ill have to call it
"Mach3's Rich Threading Algorithm".

Art
 

820

General Mach Discussion / Re: Problems threading on the lathe

« on: October 30, 2009, 12:40:25 PM »

Daniel:

   I think most of what we've done affects mainly the printer port. Though the RPM is now specific to 4 decimals for planning,
so the SS shoudl do better threads now than before. In the end, if Rich's current tests work, Ill have to work with Greg to
make a slight adjustment to the SS to make the threads a bit more accurate. The SS is known to have pretty good threads in any case, so
its not a huge concern as yet. When the PP is complete, we'll get some SS tests under way to ensure its good all over.

Thx
Art