Rack-Pinion mate, need help 1

[PEU]

Im trying to understand how to mate a rack and a pinion. Here is where I am so far

http://peu.net/temp/rack-pinion.zip

in the file you will find a rack, a pinion and the assembly.

If you guys can point me in the right direction I will appreciate. TIA !!

Pablo

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I use SW2007, no need to upgrade yet

 

[MadMango]

I don't think you can. I can't remember if SW07 had linear coupler or gear mates.

 

[PEU]

SW2007 has gear and rack-pinion mates, I just don't know how to use them

Pablo

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I use SW2007, no need to upgrade yet

 

[SincoTC]

Hi Pablo,

You've gone most of the way, but you have to select edges of the parts or sketches (it does say so in the help files but I originally missed this essential point too)! You need to make sure that your auxilliary sketches are visible with the View Menu. First Rotate the pinion so that the teeth are correctly meshed, then select Rack and Pinion in the advanvced mates tab, select the Rack Pitch (line1) and then the Pinion (Arc1)on the Auxilliary sketches, finally move the rack or pinion and tick the reverse box if necessary.

Doing it with these Pitch line sketches is a good way as it proves the geometry, but you can cheat and just select any linear edge on the rack that is parallel to the motion and a bore edge on the pinion. you would then have to tell it the pinion pitch diameter or the Rack travel/rev in the properties manager sheet. I don't like this method as the parts can be wrong and still appear to work OK.

BTW I found and reported a bug in the R&P mate and a fix is promised some time. It's not a show stopper but in complex assemblies it may throw an error message on rebuild claiming that one of the parts is fixed, but if you click OK it works properly anyway!

Trevor Clarke. (R & D) Scientific Instruments.Somerset. UK

SW2007x64 SP3.0 Pentium P4 3.6Ghz, 4Gb Ram ATI FireGL V7100 Driver: 8.323.0.0
SW2007x32 SP4.0 Pentium P4 3.6Ghz, 2Gb Ram NVIDIA Quadro FX 500 Driver: 6.14.10.7756

 

[PEU]

BINGO Trevor!!

That was exactly the help I needed, I just made it work!

Thanks for going the extra mile and explaining in such an elaborate detail.

Greetings from Buenos Aires !

Pablo

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I use SW2007, no need to upgrade yet

 

[CorBlimeyLimey]

Using the Help files is often helpful.

 

[PEU]

CorBlimeyLimey,
Used the help file but kept missing (as Trevor pointed out too) the part of the edges of the sketches. In my case the sketches for construction were hidden

Pablo

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I use SW2007, no need to upgrade yet