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Messages - airnocker

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1
I've looked into a dust collector solution for my machine like David and Bubba shared photos of that they have (are) using, but unfortunately I do not have a good way of mounting the stationary collector to my Y-axis without the resulting collector shoe becoming far larger than it really needs to be.

But I've not given up with finding an "out-of-box" solution or adapting my router mounted, 2-liter Dr. Pepper bottle dust collector so it can work with shorter bits.




2
Thanks jimmer, the compression cut end mills are great for getting aggressive DOCs in wood.  I had read up on them a few weeks ago (don't have any myself for now).


3

OK so you use tabs, that's good :)   

I didn't (still can't) see any evidence of them in the photo, maybe that's because of how you remove them?   How many tabs were there on each of the profiles?

All total there were 24 tabs, 12 on outside oval profile, the first profile to be successfully milled, and 12 on the inside oval profile the one that was 3/4" complete when the bit broke.  After the piece was unscrewed from the table, I cut thru both ends of the tabs with a fine miter hand saw to free up all three pieces.

The purpose for my wanting to cut the thin-walled oval was to test how much and what degree bit vibration occurred which would have manifested itself with the walls of the cut not having undulations.

My .015", .025, .05 and .125" DOCs at 20-45 IPM, 10000-13000 rpm in this 3/4" MDO plywood for other part milled produced beautiful, straight and smooth wall profile cuts.  So this was just a test to see how much speed I could get in cutting.   ::)



4

Like this? 

That looks ridiculously flexible to me so I'm not surprised that the piece got dragged sideways by the cutting forces.

I see from the previous pictures and video that this is your usual clamp method (external perimeter clamp or corner screws, with stock only just bigger than the piece).  Are you using something sticky under the workpiece as well? 

I'm surprised you don't have more accuracy problems, even with delicate DOC and speeds.  I'm no expert on clamping because I mostly use vacuum hold down, but when I do clamp I am very wary of flexing. Where possible I put screws through the workpiece.

If you are going to experiment with more aggressive cuts try using larger borders on your stock. Even better use tabs to retain the stiffness in the stock.

Another tactic would be to use aggressive cuts followed by a shallow cut at full depth, eg 3 cuts of 0.0.22" followed by 0.10" ,  take all the parts down to eg 90% depth before cutting any of them free. 



I've only just started using 18mm birch plywood.  One tactic I've used for a clean cut is to score all the cuts using 1mm doc with my 1/8" downcut bit, and then do the serious removal using my regular 1/4" upcut with 3x doc 6mm.  I'm sure 2x 9mm doc would work too.

My bad, I thought you were referring to the video I posted a few days ago.

That piece had two screws which are evident in the photo.  The lower piece was the one cut out with holding tabs securing it in place on both the profile cuts.  Granted, the automatic 1/8" holding tabs were not sufficient when doing the inner profile cut which no doubt resulted in vibrations.  This was a piece of scrap to test Bubba's DOC and feedrate, nothing more.

My past practice over the past decade has been far more conservative.

5
CamBam help (General usage) / Re: Cutting an angle in the Z axis - How to?
« on: February 16, 2021, 20:08:26 pm »
Knocker,
I can't supply drawings or pictures, because all the designs I manufacture are proprietary to the customers for whom I do them.

But I've done LOTS of 'sloped sides' and sloped+contoured-bottom forms for customers' casting molds, all using CB's 2.5D capabilities.

I have done many hundreds of projects in 2D and 2.5D, but only a small shoebox full of projects that required a 'true' 3D package.  I find them a pain to learn (and re-learn, as infrequently as I need them).

Lloyd

Verbal description of examples works perfectly.  So are you then referring to the Profile MOP's "Side Profile" feature?  I've used that in the past, back in 2011 I made my 2nd DIY CNC table, for creating timing belt hold-down  and tensioning blocks .  In this example the sloped side profile parameters were perfect for forming a series of rectangular sloped profiles that were mirror images to the timing belts cog profiles.

But, are there other MOPs with this useful type of feature besides the Profile MOP?


6
CamBam help (General usage) / Re: Cutting an angle in the Z axis - How to?
« on: February 16, 2021, 19:44:21 pm »
Jaydee,
CamBam's "2.5D" capabilities will serve for most jobs.  Explore all of them, before you commit to buying and learning a new, complex 3D package!

Lloyd

Lloyd, I've tried looking into this in the past and it seems that one still needs some software app for creating 3DS and/or STL files that describe the object.  What examples can you provide that fall under "for most jobs"?

Many thanks,

7
CamBam help (General usage) / Re: Cutting an angle in the Z axis - How to?
« on: February 16, 2021, 18:27:00 pm »
Sorry, but I wasn't at my computer when I suggested the Slope method.  The Profile parameter is termed "Side Profile", the Method is "Slope".

See screenshot:


8
CamBam help (General usage) / Re: Cutting an angle in the Z axis - How to?
« on: February 16, 2021, 16:22:14 pm »
profile mops have a slope parameter yoh should explore.

9
CamBam help (General usage) / Re: Cutting an angle in the Z axis - How to?
« on: February 16, 2021, 15:49:14 pm »
Hi,
I've been making  some good chips and plenty of scrap in what I would call 2D routering.   

I now have a box and the ends need an opening machining at the ends but the sides of the opening need to be angled, about 30 degrees from vertical.

I could build a little jig to hold each box on end and 2d mill the simple (inverted trapazoid ) shape out of each end.
But this would need the box mounting three times, once for each end and top. 

Are there any good proaches to this, outside of learning a £££ 3D CAD package! :)
Jay.

I have the same need and have been researching that very question.  So far it seems we need to be able to import the desired 3D shape, described in an STL or 3DS file, into CamBam then create the MOP for the shape.  I find FreeCAD and Fustion 360 might be an open-source possibility but haven't asked if anyone on this forum has used either successfully for this purpose.

 

10
Hold-downs are 4 counter-sunk 2" wood screws offset about 3/4" from the corners.

11
CamBam help (General usage) / Re: CB V1.0 always opens full screen
« on: February 16, 2021, 00:50:17 am »
From what I read on https://docs.microsoft.com/en-us/dotnet/framework/migration-guide/version-compatibility  it states:

Backward compatibility
The .NET Framework 4.5 and later versions are backward-compatible with apps that were built with earlier versions of the .NET Framework. In other words, apps and components built with previous versions will work without modification on the .NET Framework 4.5 and later versions. However, by default, apps run on the version of the common language runtime for which they were developed, so you may have to provide a configuration file to enable your app to run on the .NET Framework 4.5 or later versions. For more information, see the Version compatibility for apps section earlier in this article.

Which may explain why my 0.9.8P seems to run just fine on the later versions on both Win7 32-bit and Win10 64-bit.

12
Thanks for sharing, Bubba.  Very nice, detailed photos.


13
CamBam help (General usage) / Re: CB V1.0 always opens full screen
« on: February 15, 2021, 22:08:32 pm »
Yep, I agree, strange.

I just checked my Win7 Pro PC that I use for Mac3 and my CNC machine.  It has the 0.9.8P version of CamBam but it usings .NET 4.7.1 32-bit, while my Win 10 Pro 64-bit uses .NET 2.1.4 Core 64-bit, .NET 4.5.1 Multi-Targeting Pack and .NET 4.6.1 Targeting Pack.

I wonder if that's what is creating the odd Win 10 behavior?  .NET 4.8 is now the latest version for Win10 down through Win7.

https://docs.microsoft.com/en-us/dotnet/framework/migration-guide/versions-and-dependencies




14
Ok, another great secret of the trade from David on how to create a hinged door flap that has position brakes.  ;D

This uneven surface method is worth noting.  Sometimes the best discoveries are complete accidents.

15
CamBam help (General usage) / Re: My 2010 Dust Collection Video
« on: February 15, 2021, 21:18:50 pm »
Oh my, maybe that's why yours clogs.

Here's a YouTube video comparing the Thien Baffle vs. Dust Deputy cyclone separator efficiencies.

https://www.youtube.com/watch?v=HaTrY-O7l5E

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