Enlarging Hole

This topic has 43 replies, 20 voices, and was last updated 29 December 2017 at 10:13 by Brian Wood.

Viewing 25 posts - 1 through 25 (of 44 total)

1 2 →

Author

Posts
23 December 2017 at 14:54 #333579
Steve Crow
Participant
@stevecrow46066
Hi, this is a picture of a standard aluminium shaft support. They come in a huge range of metric sizes and are used extensively in CNC machines.

My problem is I need some to clamp 1 inch diameter bar.

I have a number of 25mm clamps. Can anyone suggest a method of opening one out by 0.4 mm?

Bear in mind that I only have a watchmakers lathe and drill press so boring is out of the question. Also, I don't want to be buying reamers or anything else.

Any suggestions?

Many thanks, Steve
Advert

23 December 2017 at 14:54 #25716
Steve Crow
Participant
@stevecrow46066
23 December 2017 at 15:16 #333583
not done it yet
Participant
@notdoneityet
A location posted might elicit help from someone local?
23 December 2017 at 15:31 #333587
Sam Longley 1
Participant
@samlongley1
Kind of puts a different slant on the "A listing of potential helpers" thread that came up a little while ago. This the second request for help that I have noticed in 2 days & it is just the sort of thing a local hobbyist might do in a very short time for a pint of beer & start a new friendship

Edited By Sam Longley 1 on 23/12/2017 15:32:24
23 December 2017 at 15:33 #333589
David George 1
Participant
@davidgeorge1
Hi Steve if you live near to me you or I could drop them on my little mill and bore them out. Sutton in Ashfield, Notts.

David
23 December 2017 at 15:36 #333590
Bob Stevenson
Participant
@bobstevenson13909
Use a piece of the 25mm bar with abrasive paper to 'work' the mounting to 1 inch…it helps to slightly taper the piece of bar for about 10mm….sit in front of the telly, put your mind where it can't be offended and get twisting the bar back and forth until it just passes into the mounting….you have effectively opened up the mounting by the thickness of the abrasive paper (which will probavly be good enough)
23 December 2017 at 15:39 #333592
Chris Evans 6
Participant
@chrisevans6
If you are close to the Lichfield area I would willingly do that for you.
23 December 2017 at 15:56 #333598
duncan webster 1
Participant
@duncanwebster1
Posted by Chris Evans 6 on 23/12/2017 15:39:33:

If you are close to the Lichfield area I would willingly do that for you.

Ditto North Cheshire
23 December 2017 at 16:30 #333606
KWIL
Participant
@kwil
Another example of the "reason" to have at least a general location on your Public Profile.
23 December 2017 at 17:41 #333622
HOWARDT
Participant
@howardt
Ream out.
23 December 2017 at 18:31 #333635
Brian Wood
Participant
@brianwood45127
Howard,

He has already said that he doesn't want to be buying reamers, his lathe is watchmaker size and he has a drill press so pretty basically equipped

Brian
23 December 2017 at 19:05 #333640
HOWARDT
Participant
@howardt
Use hand tools to chamfer end of 1" bar and cut edges into it to full diameter. Use mole grip and bore the parts through by hand. Before boring, clamp parts with spacer and bolt otherwise they will spring apart with the cut. Or if you are feeling lucky merely file the bore, it will probable close enough for what you want.
23 December 2017 at 19:06 #333641
mark costello 1
Participant
@markcostello1
Could He use a between centers boring bar? If a list of People willing to lend a hand is made, I would be available although I am "across the pond" this is a WORLD WIDE read forum and has tremendous reach and knowledge.
23 December 2017 at 19:11 #333644
Brian Wood
Participant
@brianwood45127
I am in Thirsk North Yorkshire and would be glad to help, either boring out the supports or reducing the bars to fit

Brian
23 December 2017 at 19:42 #333648
Alan Vos
Participant
@alanvos39612
My first thought was a round file. The only indication of the fit required is 'clamp'.
23 December 2017 at 19:48 #333649
HOWARDT
Participant
@howardt
The fit is achieved with the bolt clamp, bore size to a degree doesn't matter. The difference in bore size affects the centreline height of the bar but this can be got over by shimming if required.
23 December 2017 at 20:54 #333658
not done it yet
Participant
@notdoneityet
Doubtless ken whotsiname would do it for a tenner (or maybe a twenty note)….

I would ream it, if he was close, as I expect there is one lurking somewhere in the workshop.

Another alternative might be to contact the nearest model engineering society.

A hundred of us could offer locations, only to find out he is on some remote island….
23 December 2017 at 21:27 #333664
JohnF
Participant
@johnf59703
Ditto everyone who has mentioned location — why would you want/need to hide? Would help in north Lancashire
23 December 2017 at 22:03 #333669
Michael Gilligan
Participant
@michaelgilligan61133
Posted by Steve Crow on 23/12/2017 14:54:50:

… Can anyone suggest a method of opening one out by 0.4 mm?

Bear in mind that I only have a watchmakers lathe and drill press so boring is out of the question. Also, I don't want to be buying reamers or anything else.

Any suggestions?

Many thanks, Steve

.

Gentlemen

Although several of you have generously offered to do the work for Steve [if he lived nearby], may I point out: That is not what he asked for.

Addressing the actual question: I would say that the drill press is, with the use of a vice or clamps, quite capable of doing the job safely and effectively … Just make up a little boring bar [not dissimilar to a flycutter] and feed it in.

Obviously some centering device will be needed, but that's pretty much just a washer.

MichaelG.
23 December 2017 at 22:09 #333671
Roderick Jenkins
Participant
@roderickjenkins93242
I'm with Michael on this although I would be inclined to fill the gap with a sliver of something and clamp the screw up tight.

Rod
23 December 2017 at 22:09 #333672
Neil Wyatt
Moderator
@neilwyatt
Posted by JohnF on 23/12/2017 21:27:21:

Ditto everyone who has mentioned location — why would you want/need to hide? Would help in north Lancashire

Perhaps he's worried about being burgled or is concerned about identity theft?

Neil
23 December 2017 at 22:12 #333673
Michael Gilligan
Participant
@michaelgilligan61133
Posted by Roderick Jenkins on 23/12/2017 22:09:24:

… I would be inclined to fill the gap with a sliver of something and clamp the screw up tight.

.

Absolutely, Rod

I forgot to mention that.

MichaelG.
23 December 2017 at 23:39 #333687
not done it yet
Participant
@notdoneityet
Seems like flap wheel in an electric drill might be good enough? Or a cylinder hone?

Edited By not done it yet on 23/12/2017 23:41:41
24 December 2017 at 07:09 #333701
JasonB
Moderator
@jasonb
Or if you don't want to make a boring bar then what about a 1" blacksmiths drill in the drill press, would depend a bit on what speed the drill will come down two.
24 December 2017 at 10:06 #333724
Neil Wyatt
Moderator
@neilwyatt
When you say a watchmaker's lathe, how small is it?

Is it possible to clamp the block to the cross slide and use a tool held in a chuck to bore it out?

If you mount the block upside down you will only need about 1" clearance over the cross slide.
Author

Posts