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rack and pinion? Answered

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hello everyone 
im trying to design a minature working slat drive system taken from an airbusA320
the problem i have is locating a curved rack 
does anyone know where i might find one or the best way to make one 
i can get the pinion and motor etc its just the track
ive included a diagram so you can see how it all works 
its driving me mad!!

9 Replies

user
steveastrouk (author)2012-06-06

Bend one ! You can get plastic rack that you could form around the arm, or you could literally bend it with a three roll bender - though I'd bend a pair of racks mounted tooth to tooth - keep the one with the teeth on the outside of the curve. The other is sacrificial.

Or get one laser cut, if you can get away with a wooden or plastic one.

Or get one wire-cut, ifyou want a precision metal job.

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user

ultimately id like to cut the teeth in my self directly onto the arm as its a precision mechansim i cant afford it failing or snagging
how difficult is it to make a rack?

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user

Rack cutting is a specialist job, usually done industrially by planing the teeth. For small quantities, wire-edm is the only way to do this.

Steve

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user

I think that method hadn't practical to me ad I don't have the equipment
I'm experimenting with belts from an old printer and trying that out !

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canucksgirl (author)steveastrouk2012-06-06

+1

If you have a Tech Shop close to you, a laser cutter could get you whatever bend and teeth you need.

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Re-design (author)2012-06-06

Get a toothed drive belt and gear then glue the belt to a wood/plastic/metal arm that's cut to the correct shape. You can get them online at surplus parts sites.

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madaboutjets (author)Re-design2012-06-07

i like that idea
so just a case of epoxying a section onto the arm and hay presto

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user

And yet you say
....precision mechansim i cant afford it failing or snagging......

Hmm.


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