Go Back   DIY Go Kart Forum > Building Plans And Advice > All Other Parts

Notices

Closed Thread
 
Thread Tools Display Modes
  #1  
Old 05-05-2018, 06:21 PM
CampJeff CampJeff is offline
Junior Member
 
Join Date: May 2018
Location: Wilseyville, CA
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Default Novice question -

Hope thus is in the right place; apologies in advance if not-
Trying to soften the ride on my wifeís powerchair- and Iíve got wheels and tires, now need to connect to 25mm diameter motor shafts - photo is what iím trying for .
On a rear hub, ( for example, 25mm X 115mm ) does the split-clamp portion fit the 25mm axle diameter? If so, and i can track down some fairly long ones - 4Ē or so, should work.
Thanks ahead of time - sounds like alot of knowledgeable folks here!
Attached Thumbnails
33A21CD9-2243-4D1C-A39F-029EFC165456.jpeg  
  #2  
Old 05-05-2018, 08:11 PM
anickode's Avatar
anickode anickode is offline
Senior Member
 
Join Date: Apr 2010
Location: S.E. Michigan
Posts: 1,807
Thanks: 59
Thanked 804 Times in 558 Posts
Default

25mm is only 16 thou off 1"... You might be able to get away with 1" hubs if they have the right sort of locking mechanism. A tapered QD type might be able to squeeze down enough, or a split collar.

Some pics of the disassembled rear end might be helpful...

This is sort of uncharted territory for most of us here.

Off the top of my head, I would suggest doing some searching on robotics sites. I know power chair motors are very popular for robotics, like battlebots and stuff. They might have some suggestions as well.
  #3  
Old 05-05-2018, 11:10 PM
BeaterofAincrad BeaterofAincrad is offline
2018 Build-Off Contestant
 
Join Date: Apr 2018
Location: Vermont
Posts: 232
Thanks: 39
Thanked 56 Times in 42 Posts
Default

In case you or anybody else needs it, 1Ē = 25.4mm. Lots of people use something like 2.5cm(idk exactly because I donít use it), but once you get into the larger numbers, using 2.5cm gives the incorrect conversion.

Btw, I learned this in my Machining class.
  #4  
Old 05-06-2018, 02:19 PM
bob58o's Avatar
bob58o bob58o is offline
Sick, Tired, and in Debt
 
Join Date: Jan 2016
Location: Under the Rothschild Whip
Posts: 7,516
Thanks: 3,226
Thanked 2,247 Times in 1,740 Posts
Default

Quote:
Originally Posted by BeaterofAincrad View Post
In case you or anybody else needs it, 1” = 25.4mm. Lots of people use something like 2.5cm(idk exactly because I don’t use it), but once you get into the larger numbers, using 2.5cm gives the incorrect conversion.

Btw, I learned this in my Machining class.
25.4mm = 2.54cm= 0.0254 meters
25mm = 2.5cm = 0.025 meters
Study up on significant figures if interested.

At UIUC, g=9.81 m/s^2
At EIU, they use 9.8 and I was wondering what happened to the precision.

If you don't go to the 5th decimal point when using Pi in your calculations, ugghhh. LOL

3.14 makes me sick.


Sine Cosine
Cosine Sine
3.14159
__________________
History doesn't repeat but it rhymes Name a successful fiat currency in the last 5k years
  #5  
Old 05-06-2018, 06:33 PM
CampJeff CampJeff is offline
Junior Member
 
Join Date: May 2018
Location: Wilseyville, CA
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Many thanks, all!
Hadn’t considered robotics, but sure worth a look. Shafts measure .984” with my cheap digital calipers, so that’s why the 25mm starting point.
If I can get her to stay off the chair long enough . . . I’ll get some pics!
  #6  
Old 05-06-2018, 07:26 PM
itsid's Avatar
itsid itsid is online now
Moderator
 
Join Date: Jul 2013
Location: Ruhrpott [Germany]
Posts: 10,346
Thanks: 1,406
Thanked 4,362 Times in 3,281 Posts
Default

25mm isn't unseen indeed.. chances are it's either chinese or european made

First the good news.. in case the 1" hubs will fail on you for not being tight enough to clamp that metric shaft,
you can find metric hubs all over the world (at the expenses of shipping fees.. sure)
finding a chinese seller on ebay or such makes that a LOT easier.
just search for "25mm kart hub" and you'll surely find some..
be aware though american based sellers take crazy money
(114 bucks for two.. where around here one can be had for 20 bucks)
So check non US based sellers first

If that's a bit too tedious for you because say your bolthole circle is NOT that of a std metric kart wheel (it unlikely is, right)
you can go to your local machinist shop and ask for 0.2mm shim steel (a 1"x4" strip will suffice I guess)
just cut it to size and wrap that around the axle (leave the keyway alone)
and there you have it a shimmed 25.4mm axle (or what you'd call an inch )
shouldn't cost you more than maybe a buck or two

If you hubs are clamping you shouldn't need to worry though..
usually clamped hubs do not ever close up on a shaft..
so chances are you can just tighten it down as if it's an imperial axle.
And if it's too loose you could still file down the lands slightly to allow it to close even tighter
in case you can't find the shimsteel locally for example

'sid
__________________
Jokes about german sausage are the wurst.
Closed Thread

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 10:48 PM.