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Model Engineering in UK - Model engineering, metal crafts in UK
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Posted by Mike on October 24, 2008, 5:30 pm
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Hi,
I need to make a gear carrier for keying two gears together to make
new cluster and I will need to fit the 1/8 inch sq key to the 1/8 inch
x 1/16 inch slot in the carrier. I'm interested to know what is the
best way to go about this ? The key has nowhere to go when the gears
are fitted so it would seem that a press fit should be enough (no
locktite or soldering required) but can anyone tell me how much
smaller the slot should be than the key so as to get an appropriate
press fit ?
Also, as an aside, can anyone tell me what is special about key steel
cf ordinary ms square section ? The stuff I have is quite bright
compared to bms but I'm interested to know what its mechanical
properties are ?
Thanks,
Mike
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Posted by Richard Shute on October 28, 2008, 6:40 am
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On Fri, 24 Oct 2008 14:30:10 -0700 (PDT), Mike
>Hi,
>
>I need to make a gear carrier for keying two gears together to make
>new cluster and I will need to fit the 1/8 inch sq key to the 1/8 inch
>x 1/16 inch slot in the carrier. I'm interested to know what is the
>best way to go about this ? The key has nowhere to go when the gears
>are fitted so it would seem that a press fit should be enough (no
>locktite or soldering required) but can anyone tell me how much
>smaller the slot should be than the key so as to get an appropriate
>press fit ?
>
>Also, as an aside, can anyone tell me what is special about key steel
>cf ordinary ms square section ? The stuff I have is quite bright
>compared to bms but I'm interested to know what its mechanical
>properties are ?
>
>Thanks,
>
>Mike
As no one seems to have responded I chuck in my 2d's worth. As regards
fit, if you have as much as 001" interference you won't get the key in
the slot. If you have the machine to do it, an end mill or woodruff
key cutter is the ideal choice. An end mill can make slots full depth,
but blind which keeps the key captive, an woodruff cutter will result
in a ramp at one end at least.
Key steel is somewhat harder, a fair bit tougher and somewhat stronger
than 'mild' steel. I have seen En6a quoted as key steel, but I can't
find that listed in my 1980 copy of BS970. A couple of other sources
quote keysteel as variously '0.4% carbon steel' and En8, both of which
are broadly consistent with my initial comment.
Richard
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Posted by Mike on October 30, 2008, 3:50 pm
Please log in for more thread options Thanks !
Mike
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>
>I need to make a gear carrier for keying two gears together to make
>new cluster and I will need to fit the 1/8 inch sq key to the 1/8 inch
>x 1/16 inch slot in the carrier. I'm interested to know what is the
>best way to go about this ? The key has nowhere to go when the gears
>are fitted so it would seem that a press fit should be enough (no
>locktite or soldering required) but can anyone tell me how much
>smaller the slot should be than the key so as to get an appropriate
>press fit ?
>
>Also, as an aside, can anyone tell me what is special about key steel
>cf ordinary ms square section ? The stuff I have is quite bright
>compared to bms but I'm interested to know what its mechanical
>properties are ?
>
>Thanks,
>
>Mike