Recent content by ktoz

OK, thanks. Those motors may not be exactly what I need, but the daisy chaining idea is conceptually sound?

Link: https://www.tecnotion.com/products/torque-motors/qtr-series-105-133-160.html

I haven’t found a perfect fit, but these are in the ballpark size-wise: technotion.com QTR-A-160 SERIES

Hi I recently discovered torque motors and think they would be perfect for a device I’m designing, except for the fact that the power I need isn’t available in the size I’m looking for. I’m wondering if two or more smaller torque motors connected to the same shaft can provide the same power...

After several days of searching, I found the perfect solution for my “stretchy non-latex” material, designer rubber bands from Grafiti Band Joe’s. They even come in approximately the right size, are pretty cheap and come in lots of cool colors. (Although no one will ever see them)...

I'm not making the mistake of thinking I'm right, but I revisited the problem, today, by plugging a bunch of (a, b) pairs into two online ellipse calculators and managed to reverse engineer their algorithm. They seem to be using c = pi / a * sqrt((a^2 + b^2) / 2) (a is major axis, b is minor)...

Thanks. I’ll look into it. Ordered the elastomer sample pack from them Sunday.

Heh. That edit makes some pretty big assumptions. I assure you, I’m putting in plenty of effort. Besides, Edison wasn’t a lone genius toiling in his garage. The idea for a light bulb had been around for years. He succeeded primarily because he knew he couldn’t learn everything and hired a...

Haven’t finalized the design yet, so It’s a little early for molds. It’ll be fully encased, so no UV problems. Maybe grease, for the metal parts, if slippery plastics, like Acetal or UHMW require it. I’m basically looking for a material that won’t turn gummy, or dry out and weaken if left in a...

Basically the thing I want to make is a glorified rubber band. Maybe 1.75 to 2.5 inches in diameter, wall thickness of 1/8 to 5/32 inches with a width of between 1/4 and 1/2 inches. Each device gets one and I see a runaway success for sales of the devices as no more than 100. (they will be sold...

I’m kind of a vicarious bowl turning fanatic. (Don’t currently have space for wood lathe) Pretty much all of the guys I watch who use resin in their bowl turning, use either vacuum chambers and or pressure pots to remove bubbles. The thing I’m designing is very much a niche product. If it “took...

Thanks for the info! Seems like a good way to get an intuitive feel for the various types.

It’ll need to be under tension, but not stretched to its max. Flat would be best (to make the part smaller), but I could live with round. Percentage stretch is just a guess. Say something like slingshot tubing pulled back about half way. Load is also just a guess. Maybe the force needed to...

Hi I’m working on a prototype idea and think I could greatly simplify one part if I used some sort of tough stretchy rubber. Something that offers good spring-like resistance and a fast rebound. I googled many different combinations of “latex like synthetic” or “stretchy synthetic rubbers”...

Here's general formula for these types of problems. To generate terms in any regularly spaced series, use: mth term = a + m * c, where m = {0, 1, 2, 3, ...}. Applying to your series it looks like this: a + 0c = 5, solve for a, a = 5 a + 1c = 10, solve for c, c = 5 a + 2c = 15, 5 + 2 * 5 = 15 a...