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Messages - kvom

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How to's and tutorials / Re: 4 axis machining with CamBam V1.0
« on: April 07, 2022, 13:17:29 pm »
Why do you think is preferable to use the rotation center as Z0 rather than the radius? 

Or when drawing either place a separate circle over the hole before removing the keyway, or place a point at the center of the original circle.

Is it that you want to convert the arcs to a series of straight polylines?  edit/polyline/remove arcs.

CamBam help (General usage) / Re: G83/peck drilling alternative?
« on: February 02, 2022, 13:49:01 pm »
Use a custom script in the drill mop.

Does Retract Height do anything on Canned cycle drilling? (no pecking) I assume the tool retracts to the Clearance Plane? as the G code says G98.

Clearance height is set for moves to the drilling location, but the canned cycle knows nothing about it.  For G81 the drill descends to retract height at rapid speed before starting drilling and retracts to that height afterwards.  So if you're drilling multiple holes with one MOP any extra motion can be avoided by retracting just about the surface.

This assumes "standard" gcode by your control.

If the stock is defined larger than the actual material it seems to me that the first cut would not be full width,

Post CB file for help/diagnosis.

Members Projects / Re: Slide rules!
« on: August 16, 2021, 11:05:08 am »
In my college days we used slide rules and a book of trig tables.  Circular slide rule was for use in airplane cockpit when taking flying lessons in the early 70s.

I made a geocache where knowing how slide rules work is needed for the find:

Arc fit tolerance at the accuracy  level of your machine is a good start, as anything smaller won't do anything for accuracy and will result in more part in the polyline.  For parts with low tolerance increase as seems reasonable.

Always post your CB file for problems like this.  You can try the trochoidal pocket MOP too.

Assuming all of your profiles are climb (G41), then you'd need only define a single straight line at the beginning and profile it at clearance height.  This will serve as the prep move.  Specify G41 in the MOP header.  G41 setting should carry over as long as it's the same tool and climb direction.  G40 in the MOP footer of the last profile of the sequence.

This should work in theory, but I'm not running Mach3, so testing needed.

CamBam help (General usage) / Re: Tangential cycloidals
« on: June 21, 2021, 13:47:59 pm »
The perfect method for this job is wire EDM.  Perhaps you could find a company that would cut this for free given that it's for the town clock.

CamBam help (General usage) / Re: Tangential cycloidals
« on: June 20, 2021, 11:29:04 am »

Why do you want to cut the gear with an 4th axis, flat plate gears can be cut with 2.5 d operations
and this is a lot less work than 4th axis.

This option ocurred to me since that is exactly what I do, but since the pinion is 0.75" wide -- therefore 'Deep' in this case  --  it's very unlikely that a suitable cutter, which would be a maximum of 2mm Ø, would handle that depth in (say) Delrin never mind steel.

It looks as if a 1/16" cutter would fit the profile, and mine have 1/4" flute length.  I'd rough it with a larger cutter and then finish with the 1/16 using a spiral leadin with small depth increment.

CamBam help (General usage) / Re: Need help on how to mill this
« on: May 12, 2021, 14:08:42 pm »
Perhaps you previously used the Side Profile feature of the profile op specifying convex radius.

CamBam help (General usage) / Re: Engraving letters as pocket
« on: April 30, 2021, 14:08:42 pm »
totally impractical is to turn each letter in polyline

Assuming Truetype font, that's a pretty normal thing to do.  And unless the letters are more than twice the width of the cutter, a profile is better than a pocket here.

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