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  1. 8th Jan 2015, 04:02 PM #1
    Anorak Bob
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    Default More from Michael G

    An envelope arrived at home on Tuesday. In contained three 5mm wide racks and a length of brass pinion in some masterful packaging. Michael wondered if I had a use for them...I do and so will another bloke I know. Thank you Michael.

    DSCN1280 (Large).JPG DSCN1281 (Large).JPG DSCN1282 (Large).JPG DSCN1283 (Large).JPGM157030V-316_v1.jpg
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  2. 8th Jan 2015, 05:19 PM #2
    simonl
    simonl is offline Most Valued Member
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    Were they made by you Michael?
    What is the advantage of the helical shape to the rack and pinion as opposed to straight? Does it have the affect of a reduction?

    Simon
    Girl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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  3. 8th Jan 2015, 05:34 PM #3
    Michael G
    Michael G is online now Philomath in training
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    I'm denying all knowledge Simon - this Michael G guy is an embarrassment to everyone else called Michael G on this forum...

    However, the helical shape is just for smoothness. 20 degrees seems to be common with microscopes just because there is always a tooth in contact with the rack. If it were a straight rack then there would be a (slight) lack of uniformity converting the rotary motion to straight.

    Michael
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  4. 8th Jan 2015, 06:58 PM #4
    simonl
    simonl is offline Most Valued Member
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    Quote Originally Posted by Michael G View Post
    I'm denying all knowledge Simon - this Michael G guy is an embarrassment to everyone else called Michael G on this forum...

    However, the helical shape is just for smoothness. 20 degrees seems to be common with microscopes just because there is always a tooth in contact with the rack. If it were a straight rack then there would be a (slight) lack of uniformity converting the rotary motion to straight.

    Michael
    Maybe it's really Kenny G?

    Anyway, you (i) do learn something new everyday! Constant tooth contact makes sense now you mention it. I love this forum. Never stop learning!

    Thanks Michael, there will come a time when I will owe you an amount similar to a HECS debt with the amount of knowledge you (and others) have imparted to me!

    Cheers,

    Simon
    Girl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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  5. 9th Jan 2015, 02:03 PM #5
    Anorak Bob
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    Quote Originally Posted by Michael G View Post
    I'm denying all knowledge Simon - this Michael G guy is an embarrassment to everyone else called Michael G on this forum...

    However, the helical shape is just for smoothness. 20 degrees seems to be common with microscopes just because there is always a tooth in contact with the rack. If it were a straight rack then there would be a (slight) lack of uniformity converting the rotary motion to straight.

    Michael
    20 degrees and smooth it is. Here's the rack on my recently acquired Nikon SM1 scope.

    9-01-2015 10-27-35 AM.jpg
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