Forum sponsored by:
Forum sponsored by Forum House Ad Zone

Machining a cast handwheel (alignment method?)

All Topics | Latest Posts

Search for:  in Thread Title in  
1 2 Next > Last >>
Steve Wan18/12/2010 15:44:22
131 forum posts
3 photos
Hi all machinist buddies,
 
Recently I bought a cheap Chinese cast 3" dia handwheel which had an off center pre-drill hole. While running over the lathe, the outer rim and shank were out of alignment. Cracked my brains, I clamped the shank and faced the side of the rim slightly  to get it square and increased the surface area that would be bolted to a face plate.
 
I used two M6 bolt and clamped it 180deg. apart. The alignment was tough. I need to use my eyes and a fixed turning tool bit as reference, using a wooden mallet to knock at all the high points. After some struggle, I managed to get roughly aligned, tighten it and started to bore to the required size.
 
When the finished cast was done and used at my lathe spindle, I noticed that there's still slight wobble. I did not face off the circumference of the outer rim as it was chromed and rounded off in the factory. The handwheel looks similar to a sewing machine handwheel.
 
Does anyone has a better solution to share? The only raw size is the shank and the small pre-drill hole to work on...the rest is to size!
 
Steve Wan
 
 
JasonB18/12/2010 17:13:13
avatar
25215 forum posts
3105 photos
1 articles
I would hold it by the rim and bore out the hole and face the end of the central hub. This will obviously make the hole to big so you will need to turn up a suitable bush.
 
Hason
Chris Trice18/12/2010 17:14:30
avatar
1376 forum posts
10 photos
Hold the outside in a four jaw chuck then face, and bore using a boring tool?
Stub Mandrel18/12/2010 18:01:50
avatar
4318 forum posts
291 photos
1 articles
I think bolting to a faceplate is more likely to get the bore at right angles to the outer rim than using a chuck. So i think you had the right approach, but i would have used a DTI to check the rim's concentricity.
 
Neil
ady18/12/2010 20:54:59
612 forum posts
50 photos
How do you even know the OUTER wheel is ok?
 
If the centre hole sucks the entire wheel is probably pants and probably machined by some poor git on a dollar a day with 20 wheels to process or his sister gets sold into slavery.
 
SO
 
Whatcha gointa do?
 
Get some skills, that's what, and figure it out.
 
The reason so much cheap stuff is crap is because good stuff needs people with serious skills.
 
Capitalists can't afford artisans.
 
If someone gave you a million dollars to figure it out could you do it?
Alternatively: If you were utterly obsessed with producing beautiful metalwork products would that be a faster way of getting things done?
 
So, on the face of it...dial indicator the outer rim to zero, skim the inner metal bit so it's now concentric with the outer rim, then drill/bore the screw fitment to size.
 
If the outer rim isn't concentric...then cut it so it is.

Edited By ady on 18/12/2010 20:56:21

ady18/12/2010 21:00:36
612 forum posts
50 photos
And why did you you buy this wheel in the first place?
 
Do you like your fellow human beings living in misery?
 
(uh-oh...adys on the sauce)
 
Why complain about something that has a value of almost zero because it's so utterly crap...when you...as an amazing individual(EGO EGO !) can turn it into a beautiful thing.
ady18/12/2010 21:07:51
612 forum posts
50 photos
If you want a good chat tell us that spitfires were actually crap, and the

 
was a triumph of far eastern engineering excellence which would have kicked our asses...but we got lucky.
 
I know you guys have local issues, which serves the purposes of politics, but engineering transcends all tribes. It's like science, or mathematics. Tribal stuff is irrelevant.
 
Leave the monkeys to screech, we have more important things with which to enrich and fascinate our lives.

Edited By ady on 18/12/2010 21:09:43

ady18/12/2010 21:20:49
612 forum posts
50 photos
Speaking of which.
 
The KI84 and the FW190  were radial engines.
 
Did we British ever make an exceptional radial engine?

Edited By ady on 18/12/2010 21:22:35

ady18/12/2010 21:42:59
612 forum posts
50 photos
Rolls died in 1910 Royce died in 1933, after looking at the early design of the merlin.
 
So......Where did it all come from?
 
And now we have the
RB211
Originally developed for the Lockheed L-1011 (TriStar), it entered service in 1972 and was the only engine to power this aircraft type. Although the costs of development forced Rolls-Royce Limited into bankruptcy and nationalisation by the British government, the company survived and the RB211 became the first true three-spool engine, which also turned Rolls-Royce from a small player in the airline industry into a global competitor.[1]

The RB211 was officially superseded in the 1990s by the Rolls-Royce Trent family of engines, the conceptual offspring of the RB211.[1]


 
ady18/12/2010 21:47:39
612 forum posts
50 photos
And don't be ashamed by fighting your corner sir. Do not ever defer. ever.
 
We only ever learn from those people who are willing to try to better themselves.
 
god bless.
Chris Trice18/12/2010 22:50:52
avatar
1376 forum posts
10 photos
Er... it's a handwheel. Does it need to be DTI'ed (a new verb) on the rim or would a three jaw with the reverse jaws do? I suppose it depends how big your chuck is and how rounded the perimeter of the wheel is? Is it a graduated wheel? Faceplate is the other way.
Nicholas Farr18/12/2010 23:07:19
avatar
3988 forum posts
1799 photos
Hi Steve, I would choose Chris's idea, but like he says it depends on the size of the wheel and your chuck capacity.
 
Regards Nick.
ady18/12/2010 23:42:00
612 forum posts
50 photos
Did the Brits ever make a decent radial engine???
Ian S C19/12/2010 01:04:18
avatar
7468 forum posts
230 photos
Hi ady, recon the Bristol Hercules became a good engine by the 1960/70s as used in the RNZAF Bristol  Freighters and Handly Page Hastings ac, And Safe Air Freighters here in NZ, I think theTBO was over 2000hrs. Originally the Hastings was known as the best 3 engined aircraft  until they got the engines sorted out.
   The hand wheel, put it in the three jaw chuck, if the chucks too small to grip the outside of the rim , open the jaws against the inside of the rim, but you would  have a very small chuck if you had to do that on a 3" hand wheel.  Ian S C
 
  With Roll Royce and Qantas, perhaps RR may end up a small player
ady19/12/2010 01:20:47
612 forum posts
50 photos
HIya.
 
As far as I am aware we never made diddly.
 
 Ater Rolls Royce we were a waste of space.
ady19/12/2010 01:24:05
612 forum posts
50 photos
And please gentlemen.
 
Prove me wrong. Beat me to death on this one.    please.
Martin W19/12/2010 02:08:34
940 forum posts
30 photos
TO THE MODERATORS
 
Please Please delete nothing that has been posted on this thread as its brilliant .
 
Happy Christmas and a Great New Year to all the contributors to this site.
 
Cheers
 
Martin
ady19/12/2010 11:02:30
612 forum posts
50 photos
Some drunk dude hacked into my account.
...oh well, at least he stays away from the lathe when he's sloshed.
 
Merry Xmas  guys
Ian S C19/12/2010 11:19:30
avatar
7468 forum posts
230 photos
Your right really, britain did'nt have the numbers of comercial, as well as military buyers for big round/ radial  engines like the P&W R1830 Twin Wasp that powered the DC-3. Merry Chrismas and don't get too upset ady.  Our Bristol Freighters often were called 10,000 pop rivits flying in lose formation.   Ian S C
 
  ps the Aussies say that when one of our Hastings crashed at Darwin (4 engines failed on takeoff) , it did more damage than the Jap bombing during the war. It cut the highway, railway,  Darwins water and sewerage, and the power and telephone lines.  Passengers and crew gathered up their baggage, and walked out uninjured-rear facing seats.We lost two through engine failure.

Edited By Ian S C on 19/12/2010 11:28:20

Steve Wan20/12/2010 02:15:12
131 forum posts
3 photos
Hi all especially Ady!

A handful of RAF Brewster Buffalo fighters did make to our shores (Singapore) and were out-numbered and gun down by Japanese Zeros in the Battle for Malaya. RAF Spitfires was not seen here in British Malaya then, they were reserved for England for Battle of Britain. Perhaps, they were better designed and used for homeland defense instead....whose engines were made by Rolls Royce.

As regards to my handwheel. although it was poorly made...it's not the
main issue. With a skilled knowledge and correct approach, one can rework a poor
quality stuff into a high end product and improves one's skill level too. As my machining skill level grows, I intend to get low grade stuff and upgrades it...much cheaper and challenging.
Is ok to voice out grievances, we're here to learn from one another...Merry Christmas everybody! Have a great time in your cosy workshop!

Steve Wan
1 2 Next > Last >>

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Sign up to our Newsletter

Sign up to our newsletter and get a free digital issue.

You can unsubscribe at anytime. View our privacy policy at www.mortons.co.uk/privacy

Latest Forum Posts
Support Our Partners
cowells
Sarik
MERIDIENNE EXHIBITIONS LTD
Shopping Partners
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest

 

Donate

donate