Homebrew PCBs

Rob,

Have you looked at the two ebay stores I posted a few days ago?

Harvey

On 1/7/2017 4:25 PM, Rob roomberg@... [Homebrew_PCBs] wrote:
>
> I ran into this very same issue.
> I did not have any gear making tools here set up that could just knock 
> out a metal gear and
> slip onto the motor D shaft.
> After week of searching the internet I concluded that there was not 
> any instant source to replace
> my plastic gears unless I wanted to pay $75 for a custom made gear.
> http://www.learnmorsecode.com/laminator/slowmotor.jpg
> So I resorted to RC car gear suppliers and bought a pile of nearly 
> acceptable gears.
> I say nearly because I will have to drill out the smaller shaft holes 
> to fit the lamnator.
>
>  As far as designing gears being above your pay grade goes.....
> We are pushing rollers in a laminator.
> We don't care if we don't get it perfectly right.
> Look up gear making on the web and you find guys making gears out of 
> plywood
> and guy making gears with hand tools.
>
>
> On 01/07/2017 01:19 PM, Harvey Altstadter hrconsult@... 
> [Homebrew_PCBs] wrote:
>>
>> 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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>>>>
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>>>
>>
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