Author Topic: Trochoidal Pocket & Profile MOPs plugin (HSM)  (Read 85723 times)

Offline kvom

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Re: Trochoidal Pocket & Profile MOPs plugin (HSM)
« Reply #240 on: June 13, 2020, 12:12:03 pm »
I used the trocho profile once when I needed to mill some 3/4" aluminum plate.  I don't have coolant on my mill, so a deep 1/2" slot will weld chips pretty quickly.  By cutting the profile 3/4" wide using climb, my airblast has time to blow away chips when the tool moves free to start the next slice.

I'd use this MOP for most deep slots and any that are wider than the tool.

No shaking or banging with my mill (PP control).

Offline devmonkey

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Re: Trochoidal Pocket & Profile MOPs plugin (HSM)
« Reply #241 on: August 15, 2020, 14:19:41 pm »
I needed an HTD5 pulley for a project, this was a bit odd as it needed to be fixed to a spinning bearing housing rather than to a shaft so I decided to make one on the machine. I used the cambam trochoidal plugin for the roughing allowing the entire part to be milled with a 3mm endmill, took a bit longer but meant no tool change. Part was cut dry with air to clear chips, worked out really well.

Trochoidal clearing is excellent, no gummy chips sticking to the endmill. This was cut from some 5000 series (not sure exact spec) scrap plate, it is quite gummy, would have been better in 6061 but I didn't have any to hand. Still the part is more than serviceable for its intended purpose which is to drive a multi-turn encoder (near zero load). Was cut at 3mm DOC, 15% stepover, 24k rpm, 3000mm/s for clearing (although the machine never gets anywhere near this on this part due to the tiny radius of the spirals).

I will probably recut it with a high speed profile to finish, the finish pass was way too slow (600mm/s) which led to rubbing and the surface finish not being perfect. This was entirely my fault for rushing the CAM and not setting the feed.

https://www.youtube.com/watch?v=skiw7pmDoQk

Thanks for the excellent plugin!

Offline Bubba

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Re: Trochoidal Pocket & Profile MOPs plugin (HSM)
« Reply #242 on: August 15, 2020, 16:28:24 pm »
Nice! ;D
My 2ยข

Win 10 64 bit, CB [1.0} rc 1 64 bit, Mach3, ESS, G540

Offline Dragonfly

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Re: Trochoidal Pocket & Profile MOPs plugin (HSM)
« Reply #243 on: August 15, 2020, 18:24:23 pm »
I do some HTD pulleys for myself and before milling the teeth I drill the material down to the bottom with a suitable drill at the bottom of the pulley (minor diameter). This may lead to holes in the flange but it is not a problem. But help a lot milling and shaping the teeth with even a bit large tool as the narrowest part of the profile is already done by the drill.  I also usually mill a wide channel around the outer diameter (sometimes even remove the stock if the pulley part can be held down with a central screw. Thus only a small amount of material is left for milling the teeth with less tool load and achieving a good shape.
The most complicated part is to place the drill point at the exact place so the hole coincides with the bottom curve of tooth profile. Then the point is polar array copied around the center at the required step angle.
« Last Edit: August 15, 2020, 18:27:11 pm by Dragonfly »

Offline dh42

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Re: Trochoidal Pocket & Profile MOPs plugin (HSM)
« Reply #244 on: August 15, 2020, 19:26:24 pm »
Hello

A way to easy drill the HTD pulley


the following plugin are used:

http://www.atelier-des-fougeres.fr/Cambam/Aide/Plugins/MarkCenterofArcs.html

http://www.atelier-des-fougeres.fr/Cambam/Aide/Plugins/invert_selection.html

++
David

Offline CKerv

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Re: Trochoidal Pocket & Profile MOPs plugin (HSM)
« Reply #245 on: August 18, 2020, 01:41:11 am »
Could someone explain how to install this plug in?

Offline EddyCurrent

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Re: Trochoidal Pocket & Profile MOPs plugin (HSM)
« Reply #246 on: August 18, 2020, 10:00:03 am »
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Offline Dragonfly

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Copy and paste 'Trochidal pocket' - on Linux
« Reply #247 on: September 18, 2020, 13:32:35 pm »
I did a quick search and didn't find this discussed.
Often one uses copy/paste a MOP to get a new MOP with set parameters and only change the drawing objects.
This affects only 'Trochoidal pocket' MOP and only under Linux. When trying to paste there is an error message "Parameter name:field". And no pasting.
Under Windows pasting is normal. So I guess it's not a general bug for CB but something specific to its Linux version and its work with the clipboard.

P.S. It came to me that this is a plugin, not an internal CB MOP. Which perhaps makes tracking the reason more complicated.
« Last Edit: September 18, 2020, 13:46:10 pm by Dragonfly »

Offline EddyCurrent

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Re: Copy and paste 'Trochidal pocket' - on Linux
« Reply #248 on: September 18, 2020, 20:30:22 pm »
The plugin was written by JK who understands well the mechanics of copy & paste, unfortunately he does not visit this forum as often as he used to.

See here; https://cambamcnc.com/forum/index.php?topic=7564.msg60787#msg60787
and here; https://cambamcnc.com/forum/index.php?topic=7531.msg60615#msg60615

Maybe there are clues regarding the Linux version in there ?
« Last Edit: September 18, 2020, 20:31:59 pm by EddyCurrent »
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Offline dh42

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Re: Trochoidal Pocket & Profile MOPs plugin (HSM)
« Reply #249 on: September 18, 2020, 21:11:36 pm »
Hello

Topic merged with the main subject ;)
(this is not a CamBam bug)

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David

Offline Dragonfly

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Re: Trochoidal Pocket & Profile MOPs plugin (HSM)
« Reply #250 on: September 19, 2020, 09:12:30 am »
Opening the .cb file in a text editor and replicating the MOP there giving it a new name acts as a workaround.
One thing I noticed is the way the MOP is declared in comparison to the other native MOPs.
Code: [Select]
        <mop xsi:type="MOPTrochopock" Enabled="true">
          <StepOver state="Value">0.12</StepOver>
          <DepthIncrement state="Value">3.5</DepthIncrement>
          <FinalDepthIncrement state="Default">0</FinalDepthIncrement>
          <MillingDirection state="Default">Climb</MillingDirection>
          <CutOrdering state="Default">DepthFirst</CutOrdering>
          <TargetDepth state="Value">-7</TargetDepth>
          <LeadInMove state="Value">
            <LeadInType>Spiral</LeadInType>
            <SpiralAngle>2</SpiralAngle>
            <TangentRadius>0</TangentRadius>
            <LeadInFeedrate>0</LeadInFeedrate>
          </LeadInMove>
 

While a standard pocket is declared in this way:
Code: [Select]
        <pocket Enabled="true">
          <TargetDepth state="Value">-7.5</TargetDepth>
          <DepthIncrement state="Default">0.5</DepthIncrement>
          <FinalDepthIncrement state="Default">0</FinalDepthIncrement>
          <CutOrdering state="Default">DepthFirst</CutOrdering>
          <StepOver state="Default">0.4</StepOver>
          <StepoverFeedrate state="Default">Cut Feedrate</StepoverFeedrate>
          <MillingDirection state="Default">Climb</MillingDirection>