What's this called?

[PJ-27]

I know what I need to do the job, just don't know what it's called so I can't find them.

I need to have some way of attaching Saw blades to a shaft in my wooden robot, and since they have often have a 20mm internal hole I was stuck for ideas.
I think I can do with with some sort of hub that sits in the 20mm hole and has a wider flange that can attach to the blade.

Something like this if you looked at it from the side:

[Bodge Job]

Re: What's this called?

http://mobile.robotmarketplace.com/VDD-HUB20.html would this do? But I have just noticed there discontinued, what about a modifided angle grinder? That has the right hub, and you can get cordless ones?

[Laser]

Re: What's this called?

It's easier to make your own

[typhoon_driver]

Re: What's this called?

What's the issue with going for an angle grinder gearbox?

[maddox10]

Re: What's this called?

I don't see any issue except the low gearratio. Last time I messured it was 2.5-1 , perfectly capable to take 850W.

[PJ-27]

Re: What's this called?

Good find Alex! That's exactly what I need.

My plan was originally to use an Angle Grinder gearbox but I feared I'd run into complications changing the motor for a DC one.
Plus my plan is too run three blade simultaneously, so I don't want three gearboxes, I'd rather mount three blades to one shaft and then spin that.

Maybe I could nick the hubs off of Angle Grinders, been a while since I looked at one.

Thanks for the input so far everyone.

[jonny]

Re: What's this called?

make a hub on a lathe

job done?

[mattsdragons]

Re: What's this called?

Why not just buy a cordless angle grinder?

[maddox10]

Re: What's this called?

Why not just buy a cordless angle grinder?

Any idea what a decent one costs?

[mattsdragons]

Re: What's this called?

Nope, but it was just an idea

[PJ-27]

Re: What's this called?

I don't have access to a lathe unfortunately.
Tried looking at spares and repairs cordless angle grinders but no luck. Plus I'd more than likely have to swap out the motor and could run into the same complications.

I did find these though. Angle grinder flanges, I just hope the inner diameter of grinding disks is the same as circular saw disks.

http://www.amazon.co.uk/Silverline-1014 ... B002QS1MSI

[PJ-27]

Re: What's this called?

Struggling to find some specs of the flanges since they all seem to be standard, so could someone (with an angle grinder or in the know) kindly measure for me.

I need the diameter of the shoulder and it's depth.

I know the thread is M14 but I need the shoulder to be 20mm wide to hold the circular saw blade and to be less deep than the thickness of the blade.

Thanks!

[Ellis]

Re: What's this called?

Which size angle grinder mate? I have some stuff to do this second but later on I can measure for you.

[PJ-27]

Re: What's this called?

Cheers, ones with the M14 thread which is most I believe.

[Bodge Job]

Re: What's this called?

My ones 20mm that's why I said, but thee larger size may be bigger