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Messages - Tweakie.CNC

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7111
This is the way I implemented the touch plate on my machine.  http://www.cooperman.talktalk.net/files/17.htm
Hope this helps.

Tweakie.

7112
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.

7113
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. 

7114
Tangent Corner / Re: Gear cutting end mill search
« on: March 21, 2010, 01:03:47 PM »
Hi Scott,

I think you are going to have to make your own cutter.

It would seem that until such time as Paul Avis licenses or sells his patent, no one else can manufacture and sell these without the risk of patent infringement.

Tweakie.

7115
Tangent Corner / Re: Gear cutting end mill search
« on: March 21, 2010, 04:23:48 AM »
Hi Scott,

You may find this of interest. http://www.patentstorm.us/patents/6591715/description.html

Tweakie.

7116
Hi Paul,

That's some project you have taken on there.
I think you will need plenty of those bottles of beer before it is completed.  ;D
Wishing you every success with the rewiring.

Tweakie.

7117
Tangent Corner / Re: Super gearbox oil required
« on: March 17, 2010, 12:50:59 PM »
Hi John,

I have never actually seen one of these machines so not much help really.

These are sold as 'Model T' by Chester Machine Tools in the UK http://www.chesteruk.net/showrooms.htm If you live close to one of their showrooms it may be worth paying them a visit and asking for their suggestions if nothing is forthcoming on the forum (Hood should know the solution) .

Stupid suggestion but you could always go for the belt drive head. :(

Tweakie.

7118
Tangent Corner / Re: Super gearbox oil required
« on: March 17, 2010, 04:39:05 AM »
Could you perhaps post a picture so we could identify the machine ?.

Tweakie.

7119
Share Your GCode / Re: G code needed
« on: March 16, 2010, 03:17:44 AM »
Excellent work Robert.
We will make an engraver out of you yet.

Tweakie.

7120
Hi Ray,

Welcome to the forum, nice to have another in the UK. If you have any problems just ask away, there are a lot of knowledgeable guys here.

Tweakie.

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