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Posted by Steve on May 5, 2008, 6:25 am
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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
I'd forgotten I had the Ivan Law book :-)
If I look at pages 114 and 115, there are instructions to guide making
custom gear cutters, but the dimensions in the two tables (for 20deg PA and
30 deg PA) don't seem to work.
The form tool uses two steel buttons of 51.30 inches, (normalised at 1DP)
but the distance between centres is given at 49.6 inches, surely the
minimum distance between the centres is 2 x the radius of the two buttons?
ie 51.30inches.
Steve
>
> Bob
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Posted by Keith Fisk on May 5, 2008, 7:11 am
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Meccano Magazine published a gear cutting machine (made of Meccano) that
used a 1/2" BSW tap as the gear cutting hob. I don't remeber which issue
and it would take me some time to find it as I don't have an index. The
gear cutting machine worked OK for plastic - not sure about anything harder.
Keith
> 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
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Posted by Steve on May 5, 2008, 11:27 am
Please log in for more thread options
> Meccano Magazine published a gear cutting machine (made of Meccano) that
> used a 1/2" BSW tap as the gear cutting hob. I don't remeber which issue
> and it would take me some time to find it as I don't have an index. The
> gear cutting machine worked OK for plastic - not sure about anything
> harder.
> Keith
>
>> 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
>
>
Thanks Keith - hot tip! Here it is:
http://edwards.web.users.btopenworld.com/downloads/Meccanogear.pdf
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Posted by pgp001 on May 7, 2008, 4:31 pm
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I have a Mikron Hobbing machine and if you sent me some suitable blanks
I could fairly quickly put some teeth around them for you, the 127 tooth
would not be an option as I dont currently have that changewheel setup,
but most other numbers are OK if you can make some adjustments to the
design to suit. 38 or 40DP hobs are both in stock.
Phil
--
pgp001
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pgp001's Profile: http://www.rcgroups.com/forums/member.php?u=53499
View this thread: http://www.rcgroups.com/forums/showthread.php?t=858766
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Posted by Steve on May 8, 2008, 4:16 am
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>
> I have a Mikron Hobbing machine and if you sent me some suitable blanks
> I could fairly quickly put some teeth around them for you, the 127 tooth
> would not be an option as I dont currently have that changewheel setup,
> but most other numbers are OK if you can make some adjustments to the
> design to suit. 38 or 40DP hobs are both in stock.
>
> Phil
>
>
> --
> pgp001
> ------------------------------------------------------------------------
> pgp001's Profile: http://www.rcgroups.com/forums/member.php?u=53499
> View this thread: http://www.rcgroups.com/forums/showthread.php?t=858766
>
The actual gears are:
2 off 19 teeth
1 off 57 teeth
1 off 95 teeth
My eMail address is good - if you let me know the diameter of the blanks you
would need and what the beer token tally is that would be great. The
material for all four gears will be brass.
If all four are cut from scratch, then just use the best hob that suits the
tooth count.
Steve
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