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Messages - Tool-n-Around

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166
Members Projects / Custom Automotive Timing Cover
« on: February 05, 2022, 23:44:25 pm »
Hi all,

I'm a lost foam caster and have been using Cambam to machine polystyrene foam patterns for evaporative casting. This pattern was machined in several pieces and assembled. Attached are a couple pictures foam pattern and resulting casting, and a YouTube video link describing the project.

https://youtu.be/HZzx6pOaVqQ

Best,
Kelly

167
CamBam help (General usage) / Re: Machining Logo on 3D Surface
« on: January 11, 2022, 16:34:57 pm »
Hi all,

I was able to use the information offered in this post to successfully complete the project. Attached are the machined lost foam patterns next to the original part and also the two reproduction castings with the original. They are wheel centers for a limited production Chevy Truck option that are no longer available. The owner of the truck is happy to have a replacement.

Thanks to all that offered help and advice.

Best,
Kelly

168
CamBam help (General usage) / Re: Machining Logo on 3D Surface
« on: December 26, 2021, 15:53:34 pm »
Wow, so helpful and multiple ways to get there. Thank you all. I was able to produce engraved surface with several of those methods. First picture is a test cut. The logo is very clean and crisp and I was able to get a total run time of about 20 minutes.

Subsequently I modeled the backside of the same part, which uses the similar surface contour but has seven protruding bosses. I realize it could be easily modeled in an external CAD program and imported as a surface or other file, but I was experimenting with different ways to incorporate the bosses in CamBam.

I was successful creating a bounding region to exclude the bosses from the surface machining and then cleaned up the boss height with a simple 2D pocket MOP as shown in the second simulation file. I haven't made any effort to refine the surface machining or run time on the backside. This approach is reflected in the enabled MOPS in the attached CB file.

In the last two disabled 3D trial MOPs I attempted to create the bosses as solids in the first trial, and with one of the bosses as a surface in the second trial but could not come up with a way to trim or subtract the portion of the boss beyond theintersection with the surface. Can this be done within CamBam?

Best,
Kelly

169
CamBam help (General usage) / Re: Machining Logo on 3D Surface
« on: December 17, 2021, 17:17:34 pm »
Thanks for those great replies fellas. I'll see if I can use those methods to replicate those results with similar objects and let you know how I do.

Coincidently, I saw that This Old Tony video. If I didnt have a model and wanted to engrave an existing part/surface, surface mappping looks really slick.

Best,
Kelly

170
CamBam help (General usage) / Machining Logo on 3D Surface
« on: December 15, 2021, 17:26:05 pm »
Hi All,

I was experimenting for another potential project that would require machining a relief on a 3D surface. I made a shallow sperical surface using revolve extrude and then projected the logo onto that surface. I just used a rough and finish waterline to machine the spherical surface but per David's recent tutorial, realize a cmbination of waterfall and scanline near the top o fthe dome will be better. -I can work on that.

I'm having trouble figuring out how to cut the logo into the spherical surface at a given depth of cut below the surface. Do I need to define a region below the surface at depth of cut? What is the best 3D profile method for the logo? See attached.

Best,
Kelly

171
CamBam help (General usage) / Nesting and Copying to Point Lists
« on: December 01, 2021, 20:05:42 pm »
(Hopefully) Quick question regarding nesting and copying to a point lists, after having moved the machining origin. On the attached example the machining origin has been moved to the lower left corner of the stock but the component features are centered at the XY origin. The nesting was applied to a point list but the nested copies appear outside the stock (which is offset) and simulates off the stock. Is this because the stock and offset has only been specified at the Machine layer and not the corresponding Part layer for nesting?

Similary (but not in the attached example), I have used the the copy to point list plug in, and the copied objects are offset from the expected position by the (moved) machine origin displacement. Is this a similar cause/issue?

Best,
Kelly

172
CamBam help (General usage) / Re: Apply 4th Axis or Not?
« on: November 30, 2021, 00:08:56 am »
To see the toolpaths, use this app in the pic,(GRBLGru) there are other Gcode senders\Sims but this one works with all six axies. you don't have to use it as a Gcode sender just
use the sim.

Thanks Dave. I will download, and see if I can successfully simulate. From you image, it looks like I need to invert or wrap with the other side outward.

I think Ncnetic show all the way to 5 axis if I understand it correctly. I think David (DH42) is who pointed to it. https://ncnetic.com/

Thanks Bubba (and/or DH). I'll have a go with that too.

Best,
Kelly

173
CamBam help (General usage) / Re: Apply 4th Axis or Not?
« on: November 29, 2021, 22:46:14 pm »
Hi, If you use Mach3 you can simulate it. Camotics does not do 4th axis. Hope this helps

Dont have Mach. Can you simulate with Mach 3 Demo version? Says 500 line limit is lifted if not connected to machine (and parallel port not installed) but Downloaded it but no Joy as far as simulation.

Best,
Kelly

174
CamBam help (General usage) / Re: Apply 4th Axis or Not?
« on: November 29, 2021, 19:41:57 pm »
Well, I unrolled and wrapped it withthe plug-in. The unrolled file looks fine. It's wrapped aroundthe Y-axis and I hid the rest of te file. Hard to say about the wrap transformed file. I dont think CAMotics can accomodate 4th axis simulation. Doesnt look like it can.

Best,
Kelly

175
CamBam help (General usage) / Re: Apply 4th Axis or Not?
« on: November 29, 2021, 16:51:11 pm »
Have you seen the Wrapper plugin ? http://www.atelier-des-fougeres.fr/Cambam/Aide/Plugins/Wrapper_plugin.html
and the Unroll plugin; http://www.atelier-des-fougeres.fr/Cambam/Aide/Plugins/Unroll3D.html

Yes, but perhaps I didn't fully understand the applicability since I already had the desired surface from the revolve extrude. So taking a second look, if I took the pillar surface, "unrolled" per the plug in instruction and then applied the "wrapper" plug in to the resulting gcode file, it would produce 4th axis gcode file? I may need to come up with a seperate file to produce the flutes on the tapered diameter. Also maybe need to run both and end mill and ball nose profile for the included corners and a smooth surface? Is that in the right direction?

So this maybe this isn't viable approach, but simply I tried to create a 3D profile off the revolved surface and bound the tool path down the X-axis to the tool width with Primitive 49, hoping the Z depth would trace the pillar revolve surface. Then maybe alter the gcode or use custome header/footer MOP to start and stop A-axis rotation. Is that possible? For some reason I could not get Polyline 49 to convert to a region.

Best,
Kelly

176
CamBam help (General usage) / Re: Still Learning. Some Recurring Issues
« on: November 29, 2021, 02:56:17 am »
Thanks Dave. Downloaded! I'll look those files over. Even in foam, with a number of diameters of tool contact, I can rattle a bit in an inside corner.

Best,
Kelly

177
CamBam help (General usage) / Re: Apply 4th Axis or Not?
« on: November 28, 2021, 20:43:42 pm »
The 4th Axis hardware.

Best,
K

178
CamBam help (General usage) / Apply 4th Axis or Not?
« on: November 28, 2021, 20:35:19 pm »
I’ve been asked to make a scale copy of this clock tower (see picture). It will be a trophy and likely a bronze casting from yes, a lost foam pattern. I broke it into two sections for modeling and machining. I could have left it as a single piece but at 16”+ long it gets a little flexy.

The clock head was straight forward 2.5D. I have a quartz clock movement that resembles the original and fits in each side of the opening. I attached the CAMotics cut file. I would have preferred a more interesting font for the graphics but the very small size and embossed text made me settle for what I have.

I had three different thoughts on making the base and I’d like to invite some opinions on them and their feasibility. I divided the base into three sections as in the CB file layers. The lower square section is straight forward 2.5D work on each side. Just needs to be indexed 4 times at 90 degree increments. The rest is where I’d like the discussion.

For the center or what I call the pyramid section (see attached pic), I thought I’d either use the plug in for inclined/curved surface, extrude the equilateral triangle into the inclined surface or just exclude the triangular region as a region. Then index and repeat on all four sides. Might be easier if it was modeled outside CB and imported…..but this is a CB exercise. Might be able to extrude surfaces in CB too.

I read all three pages of threads with 4th axis in the title so am aware of the CB limitations and various work arounds.

My first thought was I don’t want to put a lot of effort into 4th axis work for one part and thought I’d just manually rotate the part and manually issue G-code commands for what (with 3 tools changes) were mostly just plunges and couple lateral moves. The tapered part of the pillar has 12 flutes @30 degrees that would be cut with 1/8” ball nose. I could angle the fixture for the tapered portion and flutes. -Not very studious or stretching. 
 
But I do have this cheapo 4th axis, and in addition to xyz, do have an A axis on my controller. So I could try my hand at just manually writing code for the plunges and moves but also code in the A-axis which is just spinning and indexing. Could also tip for taper flutes if need.

Then I was wondering if there was a way to vary the Z-depth of cut while moving along the x-axis (Y axis fixed on centerline) with A spinning or indexing. I thought the latter my require a surface thus the revolve extruded pillar. That could be done will a combination of a small end mill or may just the end mill will with fine steps. What say pros?

Best,
Kelly

179
CamBam help (General usage) / Re: Still Learning. Some Recurring Issues
« on: November 28, 2021, 18:26:59 pm »
Ford font from three different sites and it was a renamed same one and it was sorta like the ford script, copyright I think,…..

Yes, I found the same thing. I’ve downloaded the Ford font but find it’s more of a novelty thing.

……so then I went to the ford website and used the logo from there and modified the Image with a couple of graphics programs to extract the lines so that they were nice and smooth. I've included the CB file so that you can copy the polyline, you won’t be able to generate a file as it's pointing to my PP and Style Library.

Very nice and very nice of you to do so. Thank you very much. I’ve downloaded and saved that. I can really notice the difference as the physical size increases and real engraving is applied in various manners.

Enjoyed the video, I like the cones on the second air filter, when I first saw them I got a cheeky grin and thought Ahh man, he's just flexing now Lol.

:) I made one more variant of the air filter base. It’s for extended velocity stacks. I used the learnings from this thread to create the Bell Mouth opening as surfaces. I used the methods DH provided and it produced similar results but the run times were twice as long since it was 180 instead of 90 degrees of surfacing the Toroid/bell opening. CAMotics screen shot attached. I concluded I could very closely approximate this and other geometry with a point cutting round over bits I have which reduces the task to a simple and very fast 2.5D job. Similarly, the backside can be relieved with a simple ball nose cutter for a nice thin uniform wall to bell entry geometry.

Earlier you asked if the File Cleaner was an optimiser, no the optimiser is called feedrateadjuster …When installed this way it works seamlessly with the camotics plugin. If your up for it I'll walk you through the install and explain the minimum freedrate variable and the smoothing variable are, and how to effectively use them for maximum benefit.

I may take you up on that later. Right now, most of my programs are sub 1 hr and tool changes require some babysitting. When I get to larger 3D surface jobs, or cutting harder (than foam) materials I think it could become of great benefit.

I have used a large percentage of the CB CAD and CAM functions now and quite a few plugins. I have quite a few parts/programs to run now once I get on my feet. I haven’t shared all of those but I do have another project that I’ll post in a different thread that is further stretching me. -Stay tuned.

Best,
Kelly

180
CamBam help (General usage) / Re: Still Learning. Some Recurring Issues
« on: November 20, 2021, 23:56:36 pm »
Hello

Food for you  ;D

https://cambamcnc.com/forum/index.php?topic=9384.0

++
David

I commented in the "How To" sub foum!

Best,
Kelly

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