Nearly a wave spring washer ...
Forum rules
and Helpful information
and Helpful information
IMPORTANT: Please click here and read this first, before asking for help
Also, be nice to others! Read the FreeCAD code of conduct!
Also, be nice to others! Read the FreeCAD code of conduct!
Nearly a wave spring washer ...
I'm trying to model a single turn wave spring washer using six rectangle sketches at 60 deg intervals round the washer with every other one displaced to give the free height. Well, seven sketches in all to give one to end on.
The loft tool very nearly does a good job of joining them all together but the angle at the start and end is all awry - see attached. I was expecting the loft to pass perpendicular to each sketch but it doesn't.
Does anyone know of a work-around or should I file under 'pointless things to try to model in the first place'
The loft tool very nearly does a good job of joining them all together but the angle at the start and end is all awry - see attached. I was expecting the loft to pass perpendicular to each sketch but it doesn't.
Does anyone know of a work-around or should I file under 'pointless things to try to model in the first place'
- Attachments
-
- springwasher.fcstd
- (9.2 KiB) Downloaded 99 times
Re: Nearly a wave spring washer ...
I'll take it your trying to do an actual wave spring washer - "S" shape - and not a bowed washer - "U" shape?
I think your answer will be found more with Sweep than Loft. It will take me a bit to get back with an example, other things going on...
Mark
I think your answer will be found more with Sweep than Loft. It will take me a bit to get back with an example, other things going on...
Mark
This post made with 0.0% Micro$oft products - GOT LINUX?
Re: Nearly a wave spring washer ...
Hi Mark,
Not sure I'd call it an 'S' washer but one of these http://www.springmasters.com/sp/wave-sp ... ers-4.html.
I'll have a play with sweeps. Not sure how to draw the wavy path ... it's just playing anyhow.
Chris
Not sure I'd call it an 'S' washer but one of these http://www.springmasters.com/sp/wave-sp ... ers-4.html.
I'll have a play with sweeps. Not sure how to draw the wavy path ... it's just playing anyhow.
Chris
Re: Nearly a wave spring washer ...
It's hard to tell for sure from that drawing, looks like it's rotated a bit. This is what I went from - http://hubbardspring.com/all-category.p ... ve-washers
I didn't get to the sweep yet, but I did knock something out with a few Pads 'n Pockets.
Have a look and see if it's close. The model should have some resiliency as I avoided using any external geometry on this one. Oh, and I didn't constrain the little helper Pad.
Mark
I didn't get to the sweep yet, but I did knock something out with a few Pads 'n Pockets.
Have a look and see if it's close. The model should have some resiliency as I avoided using any external geometry on this one. Oh, and I didn't constrain the little helper Pad.
Mark
This post made with 0.0% Micro$oft products - GOT LINUX?
Re: Nearly a wave spring washer ...
Thanks a lot. I like that.
What's with the 'helper pad'? I deleted it because I thought it wasn't doing anything and that broke it.
Your model has two highs and two lows. The one I was trying to model has three highs and lows so won't be possible with your pad and pocket route. Yours is much better than my loft attempt though.
What's with the 'helper pad'? I deleted it because I thought it wasn't doing anything and that broke it.
Your model has two highs and two lows. The one I was trying to model has three highs and lows so won't be possible with your pad and pocket route. Yours is much better than my loft attempt though.
Re: Nearly a wave spring washer ...
That "helper pad" is used to provide a face to map to for the last 2 pockets. Once the "S" shape is pocketed from the cube, there is no planar surface on which to map the next sketches for the ID and OD of the washer. This thread explains the concept.chrisf wrote:Thanks a lot. I like that.
What's with the 'helper pad'? I deleted it because I thought it wasn't doing anything and that broke it.
OK, so there is a difference. I think that will need to involve a sweep then. I'll give that a go a bit later on this evening, if your not in a real big hurry for it, or someone else doesn't get to it first.chrisf wrote:Your model has two highs and two lows. The one I was trying to model has three highs and lows so won't be possible with your pad and pocket route. Yours is much better than my loft attempt though.
This post made with 0.0% Micro$oft products - GOT LINUX?
Re: Nearly a wave spring washer ...
Ahhh. I've been working around that with separate (non-parametric) constructs for months. Useful trick.quick61 wrote:That "helper pad" is used to provide a face to map to for the last 2 pockets. Once the "S" shape is pocketed from the cube, there is no planar surface on which to map the next sketches for the ID and OD of the washer. This thread explains the concept.
Chris
Re: Nearly a wave spring washer ...
I tried the sweep approach, but was a little bit dissapointed.
I made half of the sweep path with a macro. The sweep path was made with Draft.makeBSpline. But the sweep was not as smooth as I did expect. It does contain 10 points. Here is also the python code. I called it with execfile("your_path") in the python console. It seems the loft-approach but with more profiles will give a better result. Or I need more points in the B-Spline
Regards
Ulrich
I made half of the sweep path with a macro. The sweep path was made with Draft.makeBSpline. But the sweep was not as smooth as I did expect. It does contain 10 points. Here is also the python code. I called it with execfile("your_path") in the python console. It seems the loft-approach but with more profiles will give a better result. Or I need more points in the B-Spline
Regards
Ulrich
Re: Nearly a wave spring washer ...
Hi Ulrich, I am being rather disappointed by the sweep as well. Every time there is a transition in the curve, the sweep wants to fold up, (M's and W's) like the loft did at the end point with Chris. Hummm.... Going to take a bit more looking into.
This post made with 0.0% Micro$oft products - GOT LINUX?
- tanderson69
- Veteran
- Posts: 1626
- Joined: Thu Feb 18, 2010 1:07 am
Re: Nearly a wave spring washer ...
here is a couple files I played with. In the first file I had to use makehalfspace from the python console to make the 2 toolbodies.
- Attachments
-
- springwasher_ta2.fcstd
- (57.71 KiB) Downloaded 89 times
-
- springwasher_ta1.fcstd
- (197.25 KiB) Downloaded 83 times