Cutting Meccano Spec gears

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Cutting Meccano Spec gears Steve 05-03-2008
Posted by Steve on May 3, 2008, 10:12 am
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 Thinking ahead to the nex project, I will need to cut a couple of meccano
spur gears, which I'm intending to do with rotary table setup on the mill.
Anyone know what spec of cutter I need?

Thanks

Steve


Posted by Bob Minchin on May 3, 2008, 12:40 pm
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 Steve wrote:
> Thinking ahead to the nex project, I will need to cut a couple of
> meccano spur gears, which I'm intending to do with rotary table setup
> on the mill. Anyone know what spec of cutter I need?
>
> Thanks
>
> Steve
From memory, the standard gear pair that meshed on 1" centres are
38/38
50/25
57/19
60/15
The best fit for those gears is 38 dimetral pitch (DP)
OD of the blank = (no of teeth +2)/38 inches
No idea of the pressure angle. Could be normal 14 or 20 but knowing
meccano could be a special.
You might find locating 38dp cutters difficult and have to make your own.

Ivan Law's book on gear cutting could help you with this.

Good luck

Bob

Posted by Russell on May 3, 2008, 2:30 pm
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Bob Minchin wrote:

> Steve wrote:
> > Thinking ahead to the nex project, I will need to cut a couple of
> > meccano spur gears, which I'm intending to do with rotary table setup
> > on the mill. Anyone know what spec of cutter I need?
> >
> > Thanks
> >
> > Steve
> From memory, the standard gear pair that meshed on 1" centres are
> 38/38
> 50/25
> 57/19
> 60/15
> The best fit for those gears is 38 dimetral pitch (DP)
> OD of the blank = (no of teeth +2)/38 inches
> No idea of the pressure angle. Could be normal 14 or 20 but knowing
> meccano could be a special.
> You might find locating 38dp cutters difficult and have to make your own.
>
> Ivan Law's book on gear cutting could help you with this.
>
> Good luck
>
> Bob

There's a website out there that goes into great detail on this. I seem
to remember that it arguess that Meccano used a commonly available
cutter.

Try

http://www.meccanoscene.co.uk/html/articles/gears/Gears%20Appendix%20A.html

Russell

Posted by Mark Rand on May 3, 2008, 2:59 pm
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>Bob Minchin wrote:
>
>> Steve wrote:
>> > Thinking ahead to the nex project, I will need to cut a couple of
>> > meccano spur gears, which I'm intending to do with rotary table setup
>> > on the mill. Anyone know what spec of cutter I need?
>> >
>> > Thanks
>> >
>> > Steve
>> From memory, the standard gear pair that meshed on 1" centres are
>> 38/38
>> 50/25
>> 57/19
>> 60/15
>> The best fit for those gears is 38 dimetral pitch (DP)
>> OD of the blank = (no of teeth +2)/38 inches
>> No idea of the pressure angle. Could be normal 14 or 20 but knowing
>> meccano could be a special.
>> You might find locating 38dp cutters difficult and have to make your own.
>>
>> Ivan Law's book on gear cutting could help you with this.
>>
>> Good luck
>>
>> Bob
>
>There's a website out there that goes into great detail on this. I seem
>to remember that it arguess that Meccano used a commonly available
>cutter.
>
>Try
>
>http://www.meccanoscene.co.uk/html/articles/gears/Gears%20Appendix%20A.html
>
>Russell


The gears are 12tpi. Allegedly can be cut with a 3/4"BSF tap as a hob.

Mark Rand
RTFM

Posted by Steve on May 4, 2008, 4:49 am
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>
>>Bob Minchin wrote:
>>
>>> Steve wrote:
>>> > Thinking ahead to the nex project, I will need to cut a couple of
>>> > meccano spur gears, which I'm intending to do with rotary table setup
>>> > on the mill. Anyone know what spec of cutter I need?
>>> >
>>> > Thanks
>>> >
>>> > Steve
>>> From memory, the standard gear pair that meshed on 1" centres are
>>> 38/38
>>> 50/25
>>> 57/19
>>> 60/15
>>> The best fit for those gears is 38 dimetral pitch (DP)
>>> OD of the blank = (no of teeth +2)/38 inches
>>> No idea of the pressure angle. Could be normal 14 or 20 but knowing
>>> meccano could be a special.
>>> You might find locating 38dp cutters difficult and have to make your
>>> own.
>>>
>>> Ivan Law's book on gear cutting could help you with this.
>>>
>>> Good luck
>>>
>>> Bob
>>
>>There's a website out there that goes into great detail on this. I seem
>>to remember that it arguess that Meccano used a commonly available
>>cutter.
>>
>>Try
>>
>>http://www.meccanoscene.co.uk/html/articles/gears/Gears%20Appendix%20A.html
>>
>>Russell
>
>
> The gears are 12tpi. Allegedly can be cut with a 3/4"BSF tap as a hob.
>
> Mark Rand
> RTFM

Looking at the replies, the sense of it is that it's all a bit of a
compromise. The project uses four meccano gears the small brass spurs that
will look the part, and two larger steel gear wheels (127 and 56 tooth from
memory) and look cheap and nasty, which are the ones I intended to replace
with home made versions in either brass or cast iron, machined to look the
part. Sounds like I'd be better off making all four from scratch to a
current standard.

Looks like a 0.7module or 40dp cutter would be the place to be and make all
four gears instead of trying to make to the Meccano standard.

Thanks

Steve


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