By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Forum House Ad Zone

cylinder end cap

All Topics | Latest Posts

Search for:  in Thread Title in  
geoff walker 127/04/2019 17:26:56
521 forum posts
217 photos

Hi All,

I have a piece of BMS plate 1/8" thick and using it I want to make a cylinder end cap.

The cap needs to be 34mm O/dia and have a spigot 20mm dia and 1mm long to fit the cylinder bore.

Any ideas on how to hold and machine.

I have an idea but thought I would ask first to see if anyone has a better idea.

Thanks Geoff

Nick Wheeler27/04/2019 17:52:48
1227 forum posts
101 photos

Wouldn't it be simpler to machine it from bar and part it off?

SillyOldDuffer27/04/2019 17:54:31
10668 forum posts
2415 photos

If you mean like this:

endcap.jpg

I'd saw a square out of the plate and take the corners off with a file leaving a rough octagon big enough to make a 34mm disc. Then I'd super-glue the octogon to a round bar held in the chuck. I'd turn the 1mm deep spigot first, and then round off the rest of the cap.

Take it gently and the super-glue will hold the interrupted cut, (may not be necessary to file the octogon first, but it reduces the clonking!)

Super-glued parts can be separated by boiling, blowlamp, or soaking in acetone (aka nail varnish remover).

Dave

Roderick Jenkins27/04/2019 17:56:24
avatar
2376 forum posts
800 photos

I'd make it as round as I can by hand, super glue it to a face plate and then creep up on it with a very sharp tool. A bit of warmth should break the glue joint.

HTH,

Rod

Edit:  Just like Dave really frown.  Mind you if  I had a bit of bar big enough to hold in the chuck I'd make it from that, as Nichols suggests wink

Edited By Roderick Jenkins on 27/04/2019 17:59:54

Emgee27/04/2019 18:04:58
2610 forum posts
312 photos

Roderick and Dave you have some excellent super glue, what make and type please ?
Those I have would be useless for such purpose.

Emgee

JasonB27/04/2019 18:11:26
avatar
25215 forum posts
3105 photos
1 articles

Same as Dave and Rod, if you have any doubts about your glue the tailstock can be used to hold a pressure plate against the part while turned. I tend to use Mitre bond or the small 5mm bottles of Loctite superglue

David George 127/04/2019 18:18:39
avatar
2110 forum posts
565 photos

Hi Geoff I would hold in 4 jaw turn boss leaving outside till later and counter bore a 10mm conterbore as deep as the boss for a centre support. I have a piece of 10mm dia. silver steel with a centre in it to push against jobs. Take out if 4 jaw chuck and hacksaw of corners clean up and glue to a bar with super glue. Hold in place with centre support and Finnish outside diamiter and face.

David

SillyOldDuffer27/04/2019 19:10:49
10668 forum posts
2415 photos
Posted by Emgee on 27/04/2019 18:04:58:

Roderick and Dave you have some excellent super glue, what make and type please ?
Those I have would be useless for such purpose.

Emgee

I've done OK with cheapo Poundshop glue as well as more expensive brands. The trick is cleanliness and fresh, in-date, glue. Oil weakens super-glue severely, so any suspicion of grease and I wash the metals with warm water and a spot of detergent, then rinse and wipe off with Meths. Even clean metal is wiped with Meths before using super-glue.

As often as not super-glue metal to metal joints are embarrassingly strong when I try to break them. Although cleanliness may be the most important factor, super-glue seems to 'go off' fairly quickly; for me new glue seems more reliable.

Dave

not done it yet27/04/2019 19:26:03
7517 forum posts
20 photos

I would not start with BMS - it will likely warp when you remove the surface skin and fall off its substrate.

Speedy Builder527/04/2019 20:39:25
2878 forum posts
248 photos

As soon as you glued it to a boss and mounted into a chuck etc, bring a rotating centre up to bear onto the plate for extra support.

geoff walker 128/04/2019 09:38:30
521 forum posts
217 photos

Hi All,

Many thanks for all your replies, very useful. Would have replied sooner but we had a tribal tsunami (aka the grand kids) last night so not much time for internet chat!

Yes I was thinking probably have to get it roughly round then bond the plate in place and as Rod said "creep up" on it and take by surprise.

Will use the tailstock for support. I like Davids idea of using a shallow counterbore.

I'll have a go in the week and report back

Big T again to all Geoff

Hopper28/04/2019 11:26:52
avatar
7881 forum posts
397 photos

You could soft solder it to a stub mandrel rather than glue it. Much stronger.

You could hold your square of plate in the 4-jaw, face it, put the spigot on it then make a stub mandrel smaller diameter than the finished end-cover's OD. Then put a recess in the end of the stub mandrel for the spigot to fit into to help hold job in place. Then turn the square down round to finished OD and face the final surface.

geoff walker 101/05/2019 14:10:12
521 forum posts
217 photos

Hi All,

No big deal this but as you guys were kind enough to offer advice I thought I would show the results.

I was surprised just how easy, by heating, it was to break the superglue joint between the cap and the boss. 20190430_075056.jpg

20190501_131023.jpg

20190501_132751.jpg

Jobs a good 'un, thanks again Geoff

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
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