[burpg] Re: Measuring Servo Spline
- From: Alessandro Cesar Dias Gomes Filho <acgfilho@xxxxxx>
- To: burpg@xxxxxxxxxxxxx
- Date: Sun, 17 Aug 2014 18:46:04 -0300
Do they not have a datasheet?
Also, whoever does this might want to do a perspective crop on the picture
in Photoshop to make sure it is isometric.
On Sun, Aug 17, 2014 at 2:24 AM, Armor Harris <armorharris@xxxxxxxxx> wrote:
> Hey guys,
>
> We need someone back at the lab to measure the old e-regulator servo
> spline. Looks something like this
>
> http://www.servocity.com/html/hitec_servo_splines.html#.U_A6QvldV8E
>
>
> I think the best procedure here is to use a high resolution camera (read:
> not an iphone) to take a perfectly 2D picture of the servo spline with a
> pair of micrometers set to a known distance on the same plane as the servo
> spline (calipers probably aren't accurate enough unless they're really nice
> ones).
>
> Then, someone can use imageJ to measure the length in pixels of each
> spline tooth and use the distance between the micrometers in the same plane
> as a pixel to length ratio. ImageJ makes it really easy.
>
> I've done this before on another application, I used an SLR with a stock
> lens and a tripod and it worked pretty well. The setup was in a difficult
> environment but I was still able to get accuracy of less than .001" You can
> probably do better since it's in a well lit lab environment and you can
> control the photo a lot better. I would suggest is setting up the camera
> for maximum contrast so that when you zoom in, you can still see sharp
> lines.
>
> Once we get that measured, we want to try using wire EDM to machine our
> own attachments for high precision valves like the thrust vector control
> and the throttle valve. This could potentially make our servo driven valves
> a lot more reliable and rugged, so it's a really big deal if we're able to
> do this.
>
> Anyone up for it?
>
> Armor
>
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