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1  General CNC Chat / Building or Buying a Wood routing table.. Beginnners guide.. / Re: inconsistency in Z axis on: January 02, 2018, 02:53:27 AM
I cut a shoulder into the lead screw at both ends of the Z axis on my machine. Secure mounting of the pillow bearing blocks serves to form a "Clamped" lead screw. The only "Play" left is in the recirculating ball bearing nut assembly of the Z itself. I did have to experiment with different "Shims" in mounting of the pillow block bearings until I achieved movement without any binding. Also, I used the set screw hole of the coupler as the guide for where to drill an indendation into the lead screw into which the set screw is locked.  Never had any slippage since! Engravings in particular require precise repeatable movements to within .001" I realize this post is almost a year old, but perhaps anyone else who may be building their own machine, may benefit from this comment. Have a blessed new year!
2  Mach Discussion / General Mach Discussion / Re: What would be the best sensor method to detect spindle speed? on: March 07, 2017, 08:52:42 PM
I appreciate your suggestions. Since my router motor is AC powered, I was thinking of wiring a relay into the ground side of the circuit. Which would drop out, anytime the (return) current drops to zero (brushes no longer in contact with armature). This relay could be easily wired, (using a DC power supply) to trigger one of the five available inputs of the Gecko G540 I am using to drive the machine. Thanks for the advice! It was needed, to get MY mind thinking in the physical logic it will take to accomplish this task!
3  Mach Discussion / General Mach Discussion / What would be the best sensor method to detect spindle speed? on: March 03, 2017, 02:28:19 AM
Is there a way, to wire a speed sensor (light source, and photo-cell perhaps), and set up Mach3 to trigger an error (And thereby STOP program execution at the current line number)? The reason I ask, is because motor brushes wear out! And when they wear down enough, they no longer contact the armature, so the router motor stops running. Invariably resulting in a broken bit, as Mach3 continues to run (unaware that the router motor has actually stopped!). Has anyone else done this? What sort of circuit, and speed sensor device could be used for this purpose?
Thanks, in advance for any help!
4  G-Code, CAD, and CAM / G-Code, CAD, and CAM discussions / WHAT has changed in Mach 3? on: January 14, 2017, 10:05:31 AM
I have been using Mach 3 since 2008, when I built my first CNC router table. The software that I use to create tool paths include MeshCAM Art, Corel Draw, and LazyCAM Pro. I have not learned much, in terms of memorizing the various G code command set. So, I am unsure how to address a problem that has recently come up. In the past, any time I was running Mach 3 driving the machine (with either a *.NC or *.tap file loaded into Mach 3), and needed to pause program execution, I simply pressed the space bar. Which paused the machine. If I needed to make changes to things like cutting depth, etc. I would then click on the Rewind button, and click on the Router button, (to turn OFF the router). Then I would go into LazyCAM to make the needed changes. (in the case of *.tap files). However, when I attempt to do this now, I receive the following message "Unable to reverse execution, No jogging available". Any attempts at entering manual commands have no effect. Except to hit the Escape Key on the keyboard, which stops everything. Clicking the Reset button in Mach 3, runs the initialization script with the default settings that Mach 3 came with. (It loads, and executes a series of G codes which set up various things such as Metric or Inch measurement preferences, etc.) My question is this: Is there a setting in Mach 3, which prevents Rewinding a G code file during it's execution? Or perhaps a G code command, which does this? SOMETHING HAS CHANGED, and I need help understanding WHAT!
Any help with this problem will be greatly appreciated!
Thanks! -Michael
5  G-Code, CAD, and CAM / G-Code, CAD, and CAM discussions / Re: Parabolic Dish on: January 11, 2017, 11:39:39 PM
Actually what I posted wasn't entirely accurate. When MeshCAM Art created the tool path, I omitted the roughing tool path. And instead, used the tool path it had created for the finishing cut. (Even though I had specified 1/8" end mill as the cutter, I actually used a 1/4" end mill as the cutter). It turned out really smooth, and it took a total of 10 minutes to cut. I apologize to everyone, for lying about what I did. It is something that I frequently do, as far as the machine is concerned (lie about tool size). It actually produces some interesting results, to do this (IF one is willing to accept the slightly smaller carving, that results from using a cutter with a larger diameter than the diameter specified when the tool path is generated). The reason, is to produce a carving with the greatest amount of detail. By specifying a smaller diameter cutter, a more detailed tool path is generated, than is possible when specifying the actual diameter of the cutter used.
Again, THANKS everyone!
6  G-Code, CAD, and CAM / G-Code, CAD, and CAM discussions / Re: Parabolic Dish on: January 10, 2017, 05:09:35 PM
Thanks to everyone for all the advise. However, I have since solved my problem. I used MeshCAM Art to carve the dish.
I simply drew a 3" diameter circle, and colored it black. Imported the bitmap image into MeshCAM Art, and used the Shape Editor with the following specifications:
Shape: Round
Angle: 33 degrees
Starting Depth: .01"
Height Limit: No Limit
Then generated the tool path, using a 1/4" endmill as the roughing tool, and a 1/8" endmill as the finishing tool.
The result was a dish with a depth of .556" at it's deepest point (center of circle), which feathered out to zero around it's perimeter. Works for me, this cut was used to create a "funnel" which is used to guide a pinball into it's return trough slot. I was already aware that MeshCAM Art could handle it. I was simply curious to learn the math involved in manually coding such a cut. I did attempt to use the Newfangled Wizard for a circular pocket. However, there do not appear to be fields available to control the cutting depth other than a flat bottom cut. I did try editing the resulting g code, to plunge the Z deeper between each pass. Which did a pretty fair job. But it was a spiral cut, which resulted in a "threaded" spiral, in the surface. As opposed to the desired smooth slope I was looking for.
Again, THANKS everyone!
7  G-Code, CAD, and CAM / G-Code, CAD, and CAM discussions / Parabolic Dish on: January 09, 2017, 06:42:22 PM
This is for the more advanced g-code wizards: Can anyone post an example g-code program to cut a parabolic dish?
I am not (yet) familiar enough with the g code command set to accomplish this. Even just a small, six inch diameter program would be helpful in learning the math involved. I know that it is possible to cut a ramp. Having tried this last night:
X14 Z-.25 F6
results in a groove which tapers from the stock's surface, to a depth of 1/4" across a span of 14 inches at a feed rate of 6 inches per minute.
What I am looking for, is similar g code for cutting a circular pocket. With a starting depth of 0, a center depth of .5 inches, and a finishing depth of 0 (at the opposite side of the circle). I.E. a DISH! How would one express this, in g code? I know that the machine is capable, I just ain't smart enough to communicate to it the steps such a cut involves!
Thanks in advance -Michael
8  Tangent Corner / Competitions / Re: Win my Complete Collection of Cut Ready CNC Design Work ($1000.00 value) on: December 18, 2016, 11:21:03 PM
Here is a picture of my second attempt at carving a 3D face sculpture. (The first was one of my wife, who has forbid me from showing- she is ashamed of her excess weight!!)
9  General CNC Chat / Share Your GCode / Re: Total Newbie biting off more than he can chew on: December 18, 2016, 10:52:30 PM
I work with Corel Draw for most of my carvings. (profile cuts in particular, imported into LazyCAM). The DXF file format just doesn't work for me. So after many hours of trying different files formats, when exporting them from Corel Draw, I discovered that the Hewlett Packard Graphic Language *.PLT file format is the one to use. As it preserves the correct aspect ratio, and actual dimensions of the drawings. When importing them into LazyCAM. (Instead of just clicking the "open DXF" menu item, click on the "File, Open vector file", and select the HPGL *.PLT file format, then navigate to the folder where your file is stored, and click on it to open). Works great for me. And has for the past 8 years!
10  General CNC Chat / Show"N"Tell ( Your Machines) / Re: Router/Mill Design & Build on: May 14, 2016, 01:49:37 AM
Regarding the ballscrew hardness. The way that I dealt with my machine (actually an acme lead screw, instead of ballscrew), was to place the lead screw into the 3 jaw chuck on my lathe. Then locked the headstock, to prevent rotation, and used a cut off tool, to scrape a slot in the end of the lead screw. The slot was cut to match key stock which matched an existing slot on the motor coupling (in my case). It could have just as easily been a drive pulley slot (as in your case). The key slot cut into the lead screw was not cut all the way to the end of the lead screw. Which provided a "tub" slot for the key stock to be seated into. Once the motor coupling was assembled onto the lead screw, a transfer punch was used, to mark the center of the grub screw hole into the key stock. Then it was disassembled, and the key stock was drilled at the screw's center, to provide a Secure Grip of the grub screw of the motor coupling, into the detent drilled into the key stock. The key stock being seated into the "tub" slot of the lead screw prevents ANY slippage from occurring end to end! Tip: if you don't have a carbide cut-off tool for cutting the ballscrew, try mounting a Dremel tool with an abrasive wheel into the tool holder of your lathe, and cut the slot with that! It works, no matter how hard the steel is!
Good luck on your build. Looks like you've got it going on!
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