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Messages - kvom

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1
CamBam help (General usage) / Re: Thread Milling
« on: July 11, 2025, 21:33:15 pm »
A few years ago when I still had my mill I used single point threadmills.  What I discovered was that the actual tool diameters weren't exact, so I needed to experiment to get the proper thread depths.  For speeds and feeds there is a good reference on the Harvey Tools website.

2
Members Projects / Back to CNC and CamBam after a long layoff
« on: July 11, 2025, 21:12:18 pm »
Back in 2020, I sold my bed mill to a friend who needed it for his business. I had intended to buy a replacement with a tool changer, coolant, probing, etc.  But then Covid happened, and the model shows closed down.  So no place to show off the results of what I built.  During the past 5 years I just lost interest.

But now some of the shows are back in operation, and I've decided to give it another go.  This time I'm going to try building a clock;  the one I've settled on is the Strutt Epicyclic, for which there is a book by W. R. Smith.  I've now renewed my SolidWorks student subscription that I can get for $20/year as a veteran.

But what mill to buy.  I need one that fits in the shop, and isn't too heavy but does have the "convenience" factors I want.  If I want to buy new I think Tormach is about the only one that fits the parameters.  The 1100MX will cost me a bit north of $40K, which is a lot to invest if my interest level falters again.  I did find a recent used model model that wasn't too far away, but it was already sold.  So for now I've bought a DMC2 Mini as a kit, that should show up this week.  It'll probably take me a few weeks to assemble and test it, but it's a good fit for a clock project since the spindle goes to 24K.  To profile the gears (without a 4th axis) I'll need to use 3/64" endmills in brass.  The mill does have probing and coolant (good) but manual tool changing (fair) and needs Mach3 (yuk).


3
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? 

4
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.

5
Is it that you want to convert the arcs to a series of straight polylines?  edit/polyline/remove arcs.

6
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.

https://cambamcnc.com/forum/index.php?topic=9582.0

7
Quote
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.

8
If the stock is defined larger than the actual material it seems to me that the first cut would not be full width,

9
Post CB file for help/diagnosis.

10
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:

https://www.geocaching.com/geocache/GCRFRB_slide-rule-cache?guid=6a9143bf-961a-4396-96f6-6fca4daa6678

11
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.

12
Always post your CB file for problems like this.  You can try the trochoidal pocket MOP too.

13
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.

14
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.

15
CamBam help (General usage) / Re: Tangential cycloidals
« on: June 20, 2021, 11:29:04 am »
Rob

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.

Dave
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.

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