# Can Mechanism help me ?

#### behnam

##### New member
Hi, I'm having a problem.

In very simplyfied case,the problem is asfollow:

The rotor is rolling on the plate along X-Axis. I want to copy the rotor tips on the plate. ( the red curve will be copy on the plate).<?:namespace prefix = o ns = "urn:schemas-microsoft-comfficeffice" />

Is there any way to do it in Mechanism, for example: by defining a contact point between rotor tip and the plate and map the pathwhen the rotor is rolling.

Is any other way to do it, by ProM

Tanks

View attachment 967

#### SW

##### New member
Are you saying you want to the red line to be "un-rolled" so that it
lies on the plate? If this is the case, the line is a helix and so just
a straight line when mapped onto a flat surface. Its maximum X
dimension (as shown on your image) is equal to the arc length between
the rotor tip start point and end point, and the maximum Y dimension
(the horizontal dimension on your image) is the rotor face width.

You could just use a relation in Pro/ to make the line associative.

I'm not sure if I've got your question right, but I hope this helps.

Sam

#### behnam

##### New member
sam!<?:namespace prefix = o ns = "urn:schemas-microsoft-comfficeffice" /><?:NAMESPACE PREFIX = O /><O></O>

Tanks for your answer. You have right in this case the un-rolled line is straight But as I told "the figure shows a very simplified case"<O></O>

The real "rotor" is conical and will rotate "roll"around "join point".

The helix (shows in the figure) in "un-rolled" form vill not be a straight.

The helix shows as red in the figure<O></O>

/benny

Hi

View attachment 976
Edited by: behnam

#### puppet

##### Moderator
ive not done this but i beleive it will work.

1) set up ur mechanism with a rack n pinion setup

2) run it

3) mechanism ---> trace curve.

paper part is the rack(table/flat item)

edge = your edge

and select your analysis

send me the files.. i would love to test this out.