I am happy to share the link. The research was always intended to freely share with any interested wheelchair developers and has been since the original video upload.
Here is the link - https://drive.google.com/file/d/17Uri_2xHfo4Wq4HsCLQ7_V5yQ5W2R0Oc/view?usp=sharing
Hope it helps.
Hi Kyza3000
I have found the .dwg file for the wheelchair lever drive mechanism. It does include the complete drivetrain including the CVT & differential. You will need to isolate the various layers to see the location of the sprag clutches. Each drive lever is completely independent from the...
Well it looks like you are replicating my lever drive wheelchair motion I posted earlier. You will see on the video that when only using one lever the wheels spin forwards on the push and pull. With the gearbox mirrored on the other independent lever. This enables the occupant to pull on one and...
Does the op wants the reciprocating top rod to drive the axle?
Is the reciprocating rod speed rising and falling during the strokes? I guess it has to.
Do they need a constant speed at the axle or is it acceptable to also rise and fall as the input speed rises and falls?
" What is driving tour linear motion? This mechanism is designed for sinusoidal motion. Is that what you have? "
I may have misunderstood the original post. I assumed that the driven linear motion of the yellow rod needed to be converted into rotary motion. So reciprocating the yellow rod would...
Lose the short arm + pivot. Attach the end of the green arm to the axle via a sprag clutch. This will give drive in one direction only. For drive in both directions repeat at the rear adding an idler gear to reverse the direction and keep it the same direction as the front arm. The next level is...
Perhaps another green arm at the back, driven by another red pin at the back a few degrees different to the front one. Then another brown pin adjacent to the one shown but at the rear with the new arm still pivoting on the orange bearing? The blue disc would have a bearing on its perimeter and...
mfgenggear.
Yes it is an ongoing problem usually associated with staff keeping a low profile so they don't have their incompetence exposed. Often there is a philosophy where because it works it must be right. However, things can always be better, common issues I've found are:
Not using stock...
Reply to Dik
there is a magic number 0.5825.
When the answer is correctly posted to the above I will post another to consider; relating to measuring dovetails.
p.s. Engineering design does not exist without engineering manufacturing knowledge.
I think the title of the forum does not translate to the UK term for Engineer. I believe it means train driver in the US. Whereas I assumed it was a forum for engineering tips ie. machining tips.
As you suggest, I'll look for other forums that are associated with machining metals.
Thanks for the...
I could not find a reply or quote button so here is a reply to the first post from dik.
"This forum would be a good place, I would suggest. Go for it."
Here is a video and image for cutting radii simulations more accurately.
Link
I have a few machining tips that I would like to share. Is there a forum where random tips for machinists can be posted. The forum name suggests there must be an easy forum to find.
