What’s this officially called?

[Graham RounceParticipant @grahamrounce14492]

Hello! I have some electric motors with 1/8″ shafts that I want to fix things on to. I’m imagining something like this

http://www.ebay.co.uk/itm/Meccano-Parts-x-4-bush-wheels-with-8-holes-part-no-24-/230876448711?pt=UK_Construction_Toys_Kits&hash=item35c14f07c7

but of course with a smaller shaft dia.
What would it be called? Googling “bush wheel” doesn’t get me very far. Even a spur gear that I can drill fixing holes into would do.
I’ve searched a lot! Any ideas? Thank-you very much!

[Graham RounceParticipant @grahamrounce14492]

[nigel jones 5Participant @nigeljones5]

what sort of things and where do you want to fix them?

[Graham RounceParticipant @grahamrounce14492]

Hi – It will basically be a spinning wooden disc, about seven inches across.

[Jeff DaymanParticipant @jeffdayman43397]

flanged shaft hub with setscrew and x number of screw holes in flange?

JD

[Graham RounceParticipant @grahamrounce14492]

(But I’ll probably think of plenty of other stuff too!)

[Graham RounceParticipant @grahamrounce14492]

Thanks Jeff. It may well be a flanged shaft hub, but I run into the same problem when googling that as with “bush wheel” – there aren’t any!
I thought it would be a very standard object!

[Jeff DaymanParticipant @jeffdayman43397]

There is a similar item as you describe at the link below, but without the holes in the flange. You may be able to find the exact one you want on their site somewhere, they have a lot of stuff. Won't be cheap though. It would be far easier to make a disc and make a hub and solder/glue/press/weld it together.

https://sdp-si.com/ss/PDF/79001225.pdf

JD

[Gone AwayParticipant @goneaway]

Posted by Graham Rounce on 09/11/2012 21:18:49:

………………………..I run into the same problem when googling that as with "bush wheel" – there aren't any!

I got quite a lot of hits when I googled "bush wheel" (with quotes). Of course, the overwhelming majority of the hits were "noise" – which is par for the course with Google these days – but there looked like one or two actually useful hits in there.

[Ed DuffnerParticipant @edduffner79357]

I got some search results for "boss flange plate"

[Graham RounceParticipant @grahamrounce14492]

Jeff – Yes, that looks like a great company. I wish I had their warehouse near me! Unfort it’s US, and as you say probably not cheap.. I almost might try making one myself, but only as an extreme last resort!
Sid – I realised as soon as I posted that I’d exaggerated the lack with that search – the results are mainly for the Meccano part though, or what look like car components..

I can’t believe I can’t find a wheel OF ANY KIND to fit, with a set screw.

(Maybe that’s the trouble with being brought up on Meccano – your imagination stops working any other way! What I should really do, I guess, is mount the disc on some more solid bearings and drive it via a belt.. Groan. It was supposed to be a quick and easy experiment)

PS Ed – I’ll check those results, thanks.

[TerrydParticipant @terryd72465]

Hi Graham,

If the Meccano Bush wheel o/d is large enough for your needs you could modify the boss by filling the existing bore by silver soldering a bit of 4mm brass in there and re boring to 1/8", otherwise open the bore to say 6mm and make a suitable sleeve, Loctited in place. You could always make an adaptor with a bit of 6mm brass, blind bored to fit your motor shaft and the end turned to 4mm to fit the Meccano boss, or drill out and remove the Meccano boss and fit a home made one.

If the 'bush wheel' isn't large enough, 2" dia or larger Meccano sprockets which have holes are available for a couple of pounds, again you would need to modify the boss, you could use a circular plate and add a home made boss. the bosses on used Meccano parts are often loose and collectors fix them by spreading the end of the boss with a steel ball using a vice as a press (fit a grub screw to prevent the thread collapsing), or with Loctite.

PM me if you would like to try some of these solutions, I could find a few bits for you to experiment with.

Best regards

Terry

[Graham RounceParticipant @grahamrounce14492]

Thanks Terry – I don’t have the precision capability though! With a 7″ disc and a 1/8″ shaft, there won’t be much room for error for the disc not to be wobbling all over the place.

It’s actually a ring, not a disc, which I’m hoping will act as a gyroscope. A flat metal ring, 7″ dia and maybe 1/4″ dia in cross-section would be ideal, but I feel even less capable of fabricating that, with spokes, hub, etc, than I do drilling a decent clean dead straight hole! (My drill press goes up to 1/2″ – good for woodworking but not precision stuff).

[Graham RounceParticipant @grahamrounce14492]

(To be precise, a ring of 3/4″ x 3/4″ hardwood glued to a disc of 2mm ply is as far as the project’s got so far. I’m expecting to get it pretty well balanced by turning it on a lathe.)

[dcostaParticipant @dcosta]

Hello Grayham!

Have you considered the small auxiliary wheels for the children bikes?
The ones applied either at one or at both sides of the bicycle?

Best regards
Dias Costa

[Michael GilliganParticipant @michaelgilligan61133]

Graham,

Given the size of motor shaft … I think you would would do best to look at spares for Radio Control Servos.

Many of the Servos now come with a Disc/Flange instead of the traditional "Horn", and it should be easy enough to ream the hole a little with simple tools.

ServoShop seems to stock almost everything! … and they sell spares.

[I have no experience of dealing with them, but they look the business]

MichaelG.

[KWILParticipant @kwil]

Graham, Where do you live? I am sure one of us could quickly make what is required.

[Michael GilliganParticipant @michaelgilligan61133]

Graham,

If you are working with limited tooling

This little drilling template might be useful.

MichaelG.

[MICHAEL WILLIAMSParticipant @michaelwilliams41215]

**LINK**

[MICHAEL WILLIAMSParticipant @michaelwilliams41215]

In real world engineering would be called a mounting flange or a shaft mounting flange or a flanged trunnion .

Chap above does specials as well so could do small bore versions .

This editor is hard work .

MikeW

[Graham RounceParticipant @grahamrounce14492]

Hi – And thanks for all the help & suggestions..

Dias – Yes, maybe something like that at a pinch, but flatter would be best, and I’m not sure about balancing it, as it will (I hope) go round pretty fast.

Michael – I’ll look at ServoShop right away.. And, I now want one of those templates anyway!, but it’s the verticality of the drill press that I don’t quite trust.

Kwil – I’m in Bethnal Green, London (crosses fingers)

I apologise for this turning into such a saga – I thought it was going to be a quick, “Yeah it’s called a flumbj, and you can get them in a million useful sizes from Northern Flumbjs”, etc!

Michael again – a great possibility! Custom parts aren’t unreasonably priced, and I bet he/they can make them with a 1/8″ bore too! I’ll email him/them, thanks.

Graham

[Ian S CParticipant @iansc]

Not much help, but I have problems at times with pullies for my hot air engines, so most of them are bored to 3/8", then if required a bush is made, and split lengthwise, the pullies have two set screws, one is placed either side of the slit. As the pullies get changed frequently, i use brass set screws so that the shaft does not get damaged, if it slips, good the motor is producing too much power, that does'nt happen too often. One thing you might be able to do is find a little tube that fits the shaft, and fits inside the flange,cut a slit down the side of it. Maybe a meccano one with a bush could be used. One place to find small tube is telescopic radio aerials, also there is often a rack of tubes etc at hobby shops.

Ian S C

[BazyleParticipant @bazyle]

You are going to need a very good fit or adjust ment capability to avoid wobble. A normal Meccano fit is very loose by engineering standards. You also need the bush part to be as long as possible.

You can check your drill by holding a stiff L shaped 'thing' in the chuck wih the arm say 7 in long set just a fraction above the wooden flywheel on the table and rotate it by hand. Smear of paint (lipstick is good) on the end of the arm. Adjust what ever is possible eg bits of paper under the flywheel to get an even touching circle. Better is to measure the gap using feeler gauges.

If you can get a good fitting bush and a brass disc already attached to your wooden flywheel using the trued up drill above use that to hold the bush while soldering it to the disc. This takes out much of the variables or alignment leaving only the looseness of the axle.

Another thougth – how are the motor bearings going to handle the load?

[Graham RounceParticipant @grahamrounce14492]

Bazyle – Thanks for the drill-aligning tip! Simple when you know, huh?

In my brain, at least, the project is proceeding apace! – I’m now thinking of trying (if I don’t jinx it by speaking in advance) to get a steel pipe supplier to chop off (say) a 6mm thick ring from a 7″ dia pipe whose wall thickness is 6mm. This would give me a nice thin but fairly massive ring, hopefully pretty circular that I could either glue to a plywood disc as before or, more ambitiously, attempt to make spokes to a bush, and balance it somehow by attaching nuts & bolts in appropriate places.

Obviously, I do realise that this is making the recent Mars landing look like a sure thing in comparison! Luckily there’s no rush.

As for the motor handling the load, my approach is going to be: if it doesn’t, get a bigger one! The shaft sticks out a little at the other end, so I guess I could rest it on a little oiled “cup” somehow…
PS – Ian: I’ll puzzle over all that, too – I like the idea of aerials as tube sources!

[MICHAEL WILLIAMSParticipant @michaelwilliams41215]

Hi Graham ,

Would you like to tell us what your project is all about and why you need a gyroscope ?

Jww in anticipation ,

Michael Williams .

Edited By MICHAEL WILLIAMS on 11/11/2012 17:48:21

[Author]

Posts