Homebrew PCBs

Rob,

Unfortunately, knowing the spacing of the gear teeth is only the 
beginning of cutting gears. After I looked at the geargenerator website, 
I realized that it had terms that were undefined, and as a layman, I 
could not use that site. I found the definitions of the terms in the 
Nomenclature section: https://en.wikipedia.org/wiki/Gear

At that point, I decided that designing gears was above my pay grade, 
and went back to searching for ready made metal gears. This is less 
difficult, if you can find gear sets having the same diameters and 
number of teeth as your original set. The gears don't have to be 
identical to your original gears, they just have to fit the space and 
mesh. The problem that I have encountered is that I have found a gear 
set that almost meets that description, and it is difficult, without 
physically trying the fit, to determine if there is enough slop in the 
fit to allow them to mesh with the existing shaft spacing.

The reason that the diameters have to match the existing gears in the HF 
laminator, is that the motor gear drives one of the roller gears, which 
drives the other. This is a hard mount, with no springs. This means that 
there is no adjustment available between them. The motor position has 
some small degree of adjustability, but if the roller gears don't mesh 
properly, the game is over. I am still looking to find the time to 
determine whether the plastic structure that supports the roller 
bearings can take temperatures over 200�C for extended periods of time.

Harvey


On 1/7/2017 10:45 AM, Rob roomberg@... [Homebrew_PCBs] wrote:
>
> YES...better yet... IF YOU HAVE THE TECHNOLOGY
> This geargenetator.com script only runs on-line
> can NOT be stowed locally on your PC
> AND
> the reason I went to the trouble of documenting :
> How to mark a gear to cut teeth ....any size... any number of teeth
> http://www.learnmorsecode.com/gears/index.html
>
> was because some of us have really bad internet connections that will 
> not be getting any better any time
> soon so PDFs and bigger better faster complicated javascripts running 
> server side calculations  and YOUTUBE videos are off limits to these 
> guys.....
> soooo
> drop back and punt.... go old school an show how to to it with a $10 
> calculator and a pencil.
>
> I AM NOT a mathematician.
> But a mathematician made a YOUTUBE video showing
> SIN(DEG/2)2   read as: SIN of (degrees divided by 2) times 2
> will yield a number that you multiply the circle radius and have the 
> distance to mark on whatever you are cutting... metal..plastic....  
> and I thought it would be best to know this method and share it.
>
>
> On 01/07/2017 11:48 AM, 'K5ESS' k5ess.nothdurft@... 
> [Homebrew_PCBs] wrote:
>>
>> Better yet:
>>
>> http://geargenerator.com/#200,200,100,6,1,0,0,4,1,8,2,4,27,-90,0,0,16,4,4,27,-60,1,1,12,1,12,20,-60,2,0,60,5,12,20,0,0,0,2,-563
>>
>> Mike N.
>>
>> *From:* Homebrew_PCBs@yahoogroups.com 
>> [mailto:Homebrew_PCBs@yahoogroups.com]
>> *Sent:* Saturday, January 07, 2017 12:33 AM
>> *To:* Homebrew PCBs
>> *Subject:* [Homebrew_PCBs] How to mark a gear to cut teeth ....any size
>>
>> How to mark a gear to cut teeth ....any size... any number of teeth
>> http://www.learnmorsecode.com/gears/index.html
>>
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