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Messages - Tweakie.CNC

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8351
General Mach Discussion / Re: dispensing liquid with Mach 3
« on: March 26, 2010, 04:58:07 AM »
Hi Todd,

I think that using the A Axis to drive the pump would be the best solution - that way you have complete control over the volume dispensed and you could also include a small reverse direction to the A Axis after dispensing to prevent unwanted drips at the nozzle when moving to the next X-Y position.

Tweakie.

8352
General Mach Discussion / Re: zero plate problem
« on: March 26, 2010, 04:47:56 AM »
Hi Paul,

After further testing I think you may have missed out the decimal point. To retract 1/2 inch the relevant line should read :-

Code "G0 Z 0.5" 'Z-Axis retract height is set here

Tweakie.

8353
General Mach Discussion / Re: zero plate problem
« on: March 26, 2010, 03:37:33 AM »
Hi Paul,

Strange - Only retracts 0.5 on my machine.

Which version of Mach3 are you using please ?.

Tweakie.

8354
General Mach Discussion / Re: zero plate problem
« on: March 25, 2010, 01:34:54 PM »
Hi Paul,

One important point I forgot to mention - It pays to use a piece of alloy welding wire (or similar) in place of the cutter when experimenting with this routine, that way no expensive tooling is damaged if it goes pear shaped.
Once reliability is established then go for it with the proper tooling.

Tweakie.

8355
General Mach Discussion / Re: zero plate problem
« on: March 25, 2010, 12:15:10 PM »
Hi Paul,

Tried it and it worked OK on my machine ????.

I have attached a modified version of the script which you may like to try.

Make and save a copy of your existing script before deleting it and pasting the modified one into the auto tool zero VB button box. (that way nothing is lost and you can always revert back if the modified version is no good).

Hope this helps,

Tweakie.

8356
General Mach Discussion / Re: zero plate problem
« on: March 25, 2010, 05:49:26 AM »
Hi Paul,

Could you attach the macro/script you have linked to your 'Auto tool Zero' button.

Tweakie.

8357
Tangent Corner / Re: Gear cutting end mill search
« on: March 25, 2010, 05:37:46 AM »
Hi Scott,

You will find that when 2D profiling the endmill diameter will pose a limit on the smallest diameter / maximum number of teeth that can be made.
I was using a 1mm dia cutter for these parts and they are probably better described as cogs than they are as gears. They were just fine for their intended purpose but it would not be a practical manufacturing process for say replacement gears in a Futaba servo.

Tweakie.

8358
This is the way I implemented the touch plate on my machine.  http://www.cooperman.talktalk.net/files/17.htm
Hope this helps.

Tweakie.

8359
Hi Philip,

Welcome to the forum.

Describe your problem, best you can, and post on the General Mach Discussion page. The problem will be sorted - a lot of the guys here are very experienced and clever at resolving problems.

Tweakie.

8360
Tangent Corner / Re: Gear cutting end mill search
« on: March 22, 2010, 11:58:23 AM »
Hi Scott,

I think that although the endmill gear cutter is a brilliant device it is in many ways very impractical to market. A supplier could, for example, hold a thousand in stock and yet it is unlikely than any one would be suitable for the particular gear a manufacturer is intending to make. This is because the gear tooth profile and, more importantly, the shape of the gap between the teeth (and therefore the final shape of the endmill cutter) will be different for any given diameter / number of teeth and the contact angle of the gear (the portion of the involute curve forming the tooth profile is always linked to the pitch circle diameter of the gear). The picture below, perhaps rather extreme, shows to illustrate the difference in teeth profile between two gears which both have the same D.P. but differing number of teeth and therefore diameter. The endmill gear cutter could, I think, only really be a product ‘made to order’ once the size and parameters of the gear has been established and then another endmill gear cutter would have to be ordered for the meshing gear (if it was not identical to the first) and so on.
If you are up for a challenge and plan to try making one of these endmills then just as a suggestion:- An online gear profile generator can be found here http://woodgears.ca/gear_cutting/template.html once you have entered your parameters download the gear in HPGL. From the resulting file delete the first part (up to the second instance of SP1) it can then be opened into LazyCam. By deleting the unwanted chains and entities you will be left with the profile of ½ a tooth – from which you could produce the GCode toolpath for the exact shape of the endmill cutter. Milling it is another task (but not impossible) then cutting the flutes and creating the clearances from the cutting face could then be accomplished (4th axis would be nice here) followed by a hardening process. Sounds like quite a major project but it would not be beyond the grounds of possibility.
Incidentally I am no expert on gears, my only experience comes from profile cutting countless gears and escapement wheels for a friend of mine who has an insatiable appetite for designing and building wooden clocks and mechanisms.
Best of luck with the project.

Tweakie. 

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