Search:

Several years ago I found a run-down of best value linear guides... of course it wasn't black and white, but several people made great points.

I can't find it anymore... and I have some additional...

this has been postponed due to a comedy of errors... I'll return to this at the beginning of next month.

Thank you very much, those who replied... I hate to waste anyone's time. Please don't hold...

I make parts for a friend's business on my Tormach. He has just requested a batch of these particular parts, and my machine is down... then next week I travel for two weeks. Honestly, I'm looking for...

pick and place is the most common automation motion controller routine.

Motion controllers can be PC software based, or PC cards, or stand alone.
There are motion controllers for stepper, servo...

Good point.
One less joint/link is always a good thing mechanically, but adds a level of complexity in the controls... which is a good thing.
I always prefer controls complexity over mechanical...

Great PKM work samco. Linear deltas (tripods) are a great trade off of speed and footprint for rigidity and simplicity.
It isn't often one guy has that much software and mechanical ability.
How do...

Just compared the Orthoglide to the UC Riverside version called the UCR in the PKM gallery pdf found in this thread.

The Orthoglide axis are simply coupled, but the UCR is completely uncoupled. ...

There is another version of this at UC Riverside... interesting how the 3axis PKM (Delta) can have so many different types of geometry... Festo R&D has an optimized geometry for a 3DOF PKM as well....

Yeah, more of a pick and place application than anything else. But its cheap and fast for a home built...
I make hexapods too. They aren't as fast but stiff and cheap.
Fun, perhaps useful, and...

How about this type of robot arm. Cheaper, more rigid and fasssst.

these are two I made with nema23 motors.

YouTube - Fast 140ppm mid sized delta robot

YouTube - Mini Delta...

http://www.ecuriechotis.com/pkmgallery.pdf

I've stopped accumulating these... they are too many...

Jamison

I've been working on hexapods and delta robots for a while...
YouTube - Delta Tau's Brick controlled Hexapod

the video above is a hexapod with magnetic joints, and I made it for @$15k. I...

Good observation LongRat... I have a year old Fanuc VP interview where he rails against the "Spider robots" PKM's.
IMTS last week brought a zoo of new Fanuc PKM's... lol.

1

Controls for PKM's have only come around lately. Kinematics for deltas are now common, but forward/inverse kinematics for many are very complex and require serious computing power. Investment in...

A good analysis on this subject here
http://www.tormach.com/document_library/TD30689_DesignAnalysis.pdf

That video of the Renishaw is so cool. Great little machine, and a demonstrator of PKM benefits applied. I'm jealous. I'll admit it. Marketable applications for PKM machine tools are so rare....

@LongRat, I'm embarrassed, my post appears directed towards you... but was for Jammin's benefit... I suspect you could teach me a thing or three about PKM machine tools. The Renishaw machine is very...

Nice renishaw machine LongRat.

I've been working on deltas, tripods, hexapods for the past couple years for Delta Tau. I have a couple decent vids on youtube
YouTube- Fast 140ppm mid sized...

Nice.
http://www.dptechnology.com/en/products_turning.asp

Now to see the price...
Thanks Americad

Hello all,

We designers are called "typists" at work (for good reason), and machining is always best left to the real machinists... but I have been having great success these last few weeks...