convert motion
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Posted by: erfankhalilian ® 06/28/2009, 00:28:10 Author Profile eMail author Edit

hello guys... i have a question about how to convert linear motion to linear?? i want to use linkage which can revers linear motion to linear but i need the formulas...i'll be great if anyone can help me ??? actually my assignment requested to design one system that can convert 450 mm linear motion to 20 mm linear motin??

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: convert motion
: convert motion -- erfankhalilian	Post Reply	Top of thread	Engineering Forum

Posted by: CostasV ® 06/29/2009, 08:35:16 Author Profile eMail author Edit

If you ask only for linearity (and not transfer a remarkable force), then you could adjust a (soft) spring on the 450 mm motion, that would have a point marked at 20 mm when the spring is at the 450 mm position, and at 0 mm when the spring is fully charged.

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: : convert motion -- CostasV	Post Reply	Top of thread	Engineering Forum

Posted by: CostasV ® 06/30/2009, 02:50:14 Author Profile eMail author Edit

But if you want something more "mechanical", see the drawing

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: : : convert motion -- CostasV	Post Reply	Top of thread	Engineering Forum

Posted by: randykimball ® 07/02/2009, 00:03:59 Author Profile eMail author Edit

OR simply use a slip rod.. a roo that slides a distance through a bushing. If the rod cycles back and forth 450mm and the bushing is 10mm thick then the bushing will only cycle the 10mm if the rod has a stop at each end and slips the remaining distance of the cycle. For percision of secondary cycle distance and timing use rod stops at each end of the driven long rod and adjust them. This is the tried and proven method used to operate the slide valves on the steam locomotives and engines that started the whole industrial revolution. The worst suggestion of your lifetime may be the catalyst to the grandest idea of the century, never let suggestions go unsaid nor fail to listen to them.

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: : : : convert motion -- randykimball	Post Reply	Top of thread	Engineering Forum

Posted by: costasv ® 07/17/2009, 12:16:56 Author Profile eMail author Edit

If I understand corectly your message, then the movements are linear regarding the shape of track, but NOT linear regarding the ratio between them. The original question did not mention anything about linear relationship between the two movements. I only explain why I (wrongly) assumed linear relationship, in my posts.

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: : : : : convert motion -- costasv	Post Reply	Top of thread	Engineering Forum

Posted by: jboggs ® 07/18/2009, 15:20:44 Author Profile eMail author Edit

If you want a linear relationship between the rotary motion and the linear motion, use a rack and pinion.

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: : : : convert motion -- randykimball	Post Reply	Top of thread	Engineering Forum

Posted by: CCR5600Design ® 07/02/2009, 13:49:49 Author Profile eMail author Edit

One of your designs, huh Randy? Ron

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