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Old May 14, 2010, 08:52 AM
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Ward Hagaman's Avatar
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Vampire67, that is one elegant machine! Could you please give details?
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Old May 14, 2010, 03:09 PM
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vampire67's Avatar
Germany
Joined Aug 2005
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Quote:
Originally Posted by Ward Hagaman View Post
Vampire67, that is one elegant machine! Could you please give details?
The machine spawned of from a german RC forum idea: http://www.rc-network.de/forum/showthread.php?t=143987 (you would need translator)
This is th e originator: http://www.cnc-hotwire.de/ (german only too).

The original idea of an absolute low cost CNC was a little spoiled by me by using the alu-profile framing and pretty good Nema 23 motors (0.9) and microstepping control.
The table can be stowed away by swinging it down, the frame is savely above my head. So it don't steal to much workspace when not being used.
Control uses EMC2 with custom kinematics.

Disadvantage is the low lateral stability. The two wires can move sidewards. There had been some proposals to add a lateral guide that seems to fix this pretty well.
But I did not yet installed it on my machine.

For the critics, the wires are Dyneema fishing line.
Extremly durable with almost no elasticity, great material.
The acuracy is as precise as you can measure the geometry.
The beauty is the absense of any linear bearings and spindles.
I even simplified the wiches by using the motor axles directly.

regards Peter
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Last edited by vampire67; May 14, 2010 at 03:33 PM.
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Old May 14, 2010, 03:26 PM
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Thanks, very nice!
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Old May 15, 2010, 10:19 PM
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Upper tower support

Quote:
Originally Posted by mlmcquiggjr View Post
GRC159(Freddy) In your video cutting out the x29 section you quickly panned over the upper support of the cnc foam cutting machine, I happen to have a similar machine built from pdf plans bought online. Could you photograph the top of your support structure for us? Your software is very good.
Here are two pictures of the machine and the top rail. It just has 4 pieces of wood in each corner supporting a frame. The front and back are wood pieces to square the setup, the rails are reused from discarded vertical blinds. The wheels are from sliding doors hardware that you can buy at hardware stores.
It is measured and secured so that distance between the towers at the top and bottom, front and back is the same. Is is a simple addition to provide more stability to the system, and minimize wire length error. The orange device in the top front wood piece is a laser level. It makes it extremely convenient to align (center) parts to be cut.

The copper tubes are adjustable in and out and effectively reduce the wire length. In this machine I adjust between 28" down to 14" by sliding the copper tubes in and out. This is crucial when cutting small parts (like fuselage parts). Trying to cut small parts with a long wire requires (in general) the machine to have more travel and takes longer (in general).

Hope this helps.



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Last edited by grc159; May 15, 2010 at 10:40 PM.
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Old May 15, 2010, 11:27 PM
Just fly it!
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Cody, WY
Joined Nov 2007
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How are you guys who are cutting from Gcode handling the different kerf compensations between the root and the tip of tapered panels? You can't use the wire thickness.
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Old May 17, 2010, 02:46 PM
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France, Auvergne, Lapalisse
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email

can any one explain what i need to do to to set up the right email to except .exe zip i use GMail witch mail provider will allow zip .exe
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Old May 18, 2010, 02:01 AM
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Denmark
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Rename the .exe file to .old or similar. Attach to E-mail - send - and rename back to .exe

Gmail will not accept an exe file even if it is zipped.

- Michael Hammer
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Old May 25, 2010, 12:28 PM
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Germany
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Quote:
Originally Posted by wyowindworks View Post
How are you guys who are cutting from Gcode handling the different kerf compensations between the root and the tip of tapered panels? You can't use the wire thickness.
Profili allows to enter seperate values for root and tip.

For the precise value you would need to make test cuts with different speed and measure it. Usually you take a foam piece and measure the total thickness before and after slicing it a number of times.

I'm to lasy to measure it and usually just enter estimations
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Old May 25, 2010, 12:33 PM
Just fly it!
wyowindworks's Avatar
Cody, WY
Joined Nov 2007
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Quote:
Originally Posted by vampire67 View Post
Profili allows to enter seperate values for root and tip.

For the precise value you would need to make test cuts with different speed and measure it. Usually you take a foam piece and measure the total thickness before and after slicing it a number of times.

I'm to lasy to measure it and usually just enter estimations
Got it. GMFC will do that within the same package so no re-importing is necessary. I was just curious.

Adam
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Old May 28, 2010, 04:27 PM
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Joined Apr 2010
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A few more features added to TJZOIDE

A quick update, since last post I've added the following features:

1. Kerf compensation for fuselage parts, per cross section, per cut id, per
projection (forward or back). You enter the values as needed.
2. Import .DAT files for cross sections.
3. Full, 1/2, 1/4, 1/8, 1/16 resolution steps in conjunction
with 20, 10, and 5 TPI lead screws.
4. Rotate objects 90 degrees.
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Old Jun 10, 2010, 12:41 AM
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Quote:
Originally Posted by grc159 View Post
A quick update, since last post I've added the following features:

1. Kerf compensation for fuselage parts, per cross section, per cut id, per
projection (forward or back). You enter the values as needed.
2. Import .DAT files for cross sections.
3. Full, 1/2, 1/4, 1/8, 1/16 resolution steps in conjunction
with 20, 10, and 5 TPI lead screws.
4. Rotate objects 90 degrees.
Looks like a very interesting program - good job!
Do you plan to provide a free evaluation copy?
Is it possible to switch to metric units and can the thread pitch of the lead screw also be set to any free value, except the 20, 10 and 5 TPI ?

Phil
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Old Jun 10, 2010, 08:15 AM
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Quote:
Originally Posted by heliinferno View Post
Looks like a very interesting program - good job!
Do you plan to provide a free evaluation copy?
Is it possible to switch to metric units and can the thread pitch of the lead screw also be set to any free value, except the 20, 10 and 5 TPI ?

Phil
Thanks Phil! I can provide a demo version, Cut and Save features disabled. PM me if you are interested. I am currently implementing HPGL import. That will be available next release along with a few other minor features. Current version only supports 20, 10 and 5 TPI, inch units. I am looking into metric version and various TPI, no time table yet for it, as although simple in concept, it is a major feature that effects the program across the board.

Fredy
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Old Jun 28, 2010, 03:37 AM
qwerty1000's Avatar
Russia, Moscow, g. Moskva
Joined Sep 2007
614 Posts
I use mastertcam & mach, technology tetris.
http://bukvorez.ru/blog/_su-27.htm
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Old Jun 28, 2010, 06:28 AM
EDF rules... :)
AirX's Avatar
Joined Nov 1999
13,592 Posts
Qwerty1000,

Very nice work on the Su27. Can you explain where to get the programs you use?

Eric B.
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Old Jul 01, 2010, 12:56 AM
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Russia, Moscow, g. Moskva
Joined Sep 2007
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Quote:
Originally Posted by AirX View Post
Qwerty1000,

Very nice work on the Su27. Can you explain where to get the programs you use?

Eric B.
Following algorithm: 3DMax-AutoCad-Corel-Mastercam-CIMCOEdit-Mach3.
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