How can this piece be saved ?

This topic has 13 replies, 8 voices, and was last updated 23 June 2016 at 12:19 by Ian S C.

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22 June 2016 at 12:57 #243813
Brian John
Participant
@brianjohn93961
I have used too much solder again and it has flowed through underneath the hot cap. I was almost going to bin it but thought I should ask first : is there any way to save this piece ? The cap end will not fit in my small lathe chuck ; it is just a bit too big. That would have been ideal because then I could have machined off that excess solder.

Is there some way to hold it by the stainless steel tube by making up some sort of clamp ?
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22 June 2016 at 12:57 #8176
Brian John
Participant
@brianjohn93961
Too much solder…again !
22 June 2016 at 18:15 #243839
Martin Connelly
Participant
@martinconnelly55370
Can you carve the solder away with a craft knife?

Martin
22 June 2016 at 18:17 #243840
JasonB
Moderator
@jasonb
Brian can you post a photo.

Is it soft or silver solder?
22 June 2016 at 21:28 #243857
Bazyle
Participant
@bazyle
Make a wood plate with a boss that you can grip in your chuck, then turn a recess in it that takes the tube tightly using light glue if necessary other wedging mechanism.
23 June 2016 at 02:01 #243876
Brian John
Participant
@brianjohn93961
I did post a photo…it was there last night !

It is hard solder. It might be easier to bin it and make a new one but I am interested to know if this can be done.

Edited By Brian John on 23/06/2016 02:03:38
23 June 2016 at 06:54 #243877
Michael Gilligan
Participant
@michaelgilligan61133
Brian,

That looks simple enogh …

Cut a vee grooove in a block of wood, for the piece to lay in; and get to work with some needle files. … Finger pressure to hold it in the vee, and work steadily; rotating it a little, every few strokes of the file.

MichaelG.

Edited By Michael Gilligan on 23/06/2016 06:59:40
23 June 2016 at 07:11 #243878
MW
Participant
@mw27036
I reckon if you've got a long piece of studding and some wide flat washers you could tighten the whole thing up and that would allow you to put it in your drill chuck. You could use some really long coach bolts and the washers you can pick up from anywhere.

Just get it to run fairly true and use a file and emery, doesn't matter if it's not 100%

Michael W

Edited By Michael Walters on 23/06/2016 07:14:43
23 June 2016 at 08:00 #243880
JasonB
Moderator
@jasonb
Posted by Brian John on 22/06/2016 12:57:55:

The cap end will not fit in my small lathe chuck ; it is just a bit too big.

Brian I think you are refering to being able to put the whole tube into the chuck but the hole in the body is too small/short. You turned the endcap so it must fit in the jaws.

You can do it just by holding the small soldered on endcap. Make a stepped plug that is a good fit into the bore, the larger dia will stop it going in to far. Drill a ctr hole into the larger end of the plug.

No hold part by the usual jaws in the 3-jaw chuck, pop the plug into the open end, bring up the tailstock for support and now you can skim off the solder without ripping the work from the chuck. This will keep things as true as possible which is needed to stop the piston binding if things get out of line.

Edited By JasonB on 23/06/2016 08:09:26

Edited By JasonB on 23/06/2016 08:10:26
23 June 2016 at 10:16 #243893
Brian John
Participant
@brianjohn93961
Jason, I had something similar in mind (my idea was much more complicated) but I was not sure if it would work. I will give that a go tomorrow.

NOTE : I am not keen on filing it off by hand (yet), as that could damage the flat surface on the underside of the collar.

Michael W : what do you mean by ''studding'' ?

Edited By Brian John on 23/06/2016 10:17:37

Edited By Brian John on 23/06/2016 10:20:30
23 June 2016 at 10:29 #243894
John Rudd
Participant
@johnrudd16576
Studding = threaded bar rod that has a thread running the full length.

Available at minimal cost at your local Screwfix or at extortionate prices at b n q……in various sizes……
23 June 2016 at 10:42 #243895
JasonB
Moderator
@jasonb
Brian. I think Michael W's thought that the hole goes all the way through but as it is capped off the studding won't fit.
23 June 2016 at 11:10 #243896
MW
Participant
@mw27036
Yeah sorry, studding is a long threaded rod thats normally sold in D.I.Y places, like John pointed out. I didn't know that there was no thru-hole so you'd probably be better off going along with JasonB's solution.

If you ever get in a bind again with odd sized work pieces you can turn a mandrel (stepped shoulder or supporting cylinder) and use thread lock to set it in place and lightly turn the work piece down. To take it off again use a little heat from a blow lamp/propane torch and the whole assembly should come apart with a few calculated taps with a soft faced hammer (and rod if you need it), it's magic. You can clean off the residue with a light abrasive or a pipe cleaner.

Very useful technique for getting two diameters to be completely concentric to one another. I'm sure it's well known but i think i'll just rehearse it here so that i spread the word

Michael W

Edited By Michael Walters on 23/06/2016 11:13:50
23 June 2016 at 12:19 #243899
Ian S C
Participant
@iansc
Studding is known as Allthread in Australia and New Zealand, and comes as plain steel, galvanised steel, and stainless steel. I think you can get it in brass also. In NZ it comes in metric coarse, UNF& UNC. Ian S C

Edited By Ian S C on 23/06/2016 12:21:29
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