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Optical chucks

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An Optical Finder

An Optical Finder

A useful article from the first issue of Model Engineer's Workshop by 'Bluey' - a pen-name of Stan Bray who was the first editor of MEW.

hawkeyefxr30/01/2017 13:52:52
11 forum posts

Back in the dark ages (1964) i was into my apprenticeship, at this time i was in the toolroom. It was just a small toolroom with myself and 'arry'.

Anyway we had a bench pillar drill that had an optical chuck, you viewed through an optic and could see down to your work piece and see you scratch lines from the vertical vernier. You line the cross hairs up and used a centre drill for quite accurate drilling.

No a patch on todays CNC machining i know.

My question is are these still made, are there IR deices that do the same. I have looked but cannot find anything even resembling what i am looking for. I don't even know if Optical chuck is the right name for them.

I need to drill eight holes fairly accuratley, hoping someone can help me or maybe just tell me i am completley mad.

Edited By hawkeyefxr on 30/01/2017 13:53:48

Nick_G30/01/2017 14:23:32
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1808 forum posts
744 photos
Posted by hawkeyefxr on 30/01/2017 13:52:52:

I need to drill eight holes fairly accuratley, hoping someone can help me or maybe just tell me i am completley mad.

Edited By hawkeyefxr on 30/01/2017 13:53:48

.

If they do still exist I would imagine a decent quality one would be many times the price of a DRO system.

Nick

davidk30/01/2017 14:32:09
44 forum posts

Something similar was discussed back in 2015:

**LINK**

Regards

David

KWIL30/01/2017 15:08:04
3064 forum posts
56 photos

What do you mean by "fairly accurate"? Define the problem and layout.

Roderick Jenkins30/01/2017 15:56:11
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1720 forum posts
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Perhaps something like this **LINK**

Rod

hawkeyefxr30/01/2017 16:35:50
11 forum posts
Nick
Whats a DRO system?
By fairly accurate i mean 2 to 4 thou max
I have looked at the links but they deal more with description. I realise time has moved on but i thought i would find some kind of lead.
I have a wood turning chuck, it's similar to an engineering one except where the jaws on an engineering chuck hold the work piece on a wood chuck there are different secondary jaw sets that bolt to the jaws that run on the scroll.
i want some jaws that fit my particular chuck that allow me to mount a piece of ply where by i can machine the ply to hold a bowl.
Basically a 5in dia x 1/2 flat disk, it's then cut into four quarter each with two holes in to locate to the chuck jaws.
http://www.leevalley.com/US/wood/page.aspx?p=69101&cat=1,330,69091,69184&ap=1

Nick_G30/01/2017 16:41:09
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1808 forum posts
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Posted by hawkeyefxr on 30/01/2017 16:35:50:
Nick
Whats a DRO system?

.

A 'Digital Read-Out' system.

But having been now seen the link kindly provided by Rod it may seem that I was wrong about the costing.

But you would of course then have to make the optical device linked. And it's accuracy for ever more would depend on how accurate you made it in the first place. smiley

Nick

Journeyman30/01/2017 16:49:47
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581 forum posts
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This web article describes a home build centre finder using the inards of a cheap web cam, might be of use. Issue 121 of MEW

John

Edited By Journeyman on 30/01/2017 16:52:38

AJW30/01/2017 17:25:48
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261 forum posts
117 photos
I used to deal with an old time toolmaker who used something like you describe, don't know what it was called but it was basically a clear plastic block with a hole in it. Across the underneath face it had two lines engraved/scribed, these lines were lined up vidually on your marked out work and a close fitting centre punch dropped into the hole and tapped.
This guy could work to close tolerances using it!

Alan
Rik Shaw30/01/2017 17:38:06
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1253 forum posts
345 photos

Alan - That would be an optical centre punch. I have one made by Mr.Dankroy and very good it is to. I use all the while.

Rik

Cornish Jack30/01/2017 17:48:39
879 forum posts
111 photos

The very first issue of MEW carried just such a device - home brewed, of course and very simple - it must have been 'cos I made one and it worked!smiley It may still be lurking in the chaotic shambles of my workshop but more likely went to the skip with the other debris from the 'surge'. I also had a much rarer beast - a drill chuck on a 2MT taper which had a built-in centring viewer!! Clever idea but a bit short on practicality, as you had to place your eye against the chuck body to view the centre!sad If not available elsewhere, I may be able to send you a copy of the MEW article, assuming Neil and his paymasters don't object.wink

rgds

Bill

Tractor man30/01/2017 18:04:45
426 forum posts
1 photos
Centre scope but a costly item to ensure accuracy as a one off. Mick
Neil Wyatt30/01/2017 22:02:05
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Posted by Cornish Jack on 30/01/2017 17:48:39:

If not available elsewhere, I may be able to send you a copy of the MEW article, assuming Neil and his paymasters don't object.wink

rgds

Bill

Tell you what, send me a scan of it and I'll put it up on the website

SteveM30/01/2017 22:36:40
62 forum posts
16 photos

Stefan Gotteswinter shared an excellent video on YouTube about the design and construction of an optical microscope. Like all his videos it's very interesting and well worth watching.
Centering Microscope

JohnF30/01/2017 23:28:22
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784 forum posts
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Hawkeye you are not mad they were in regular use in the 60's bothe before and after that time they were called Optical Centre finders as far as I recall, used them many times.
Both Roderik and Steve M are spot on but the ones I used the eye piece was at 45 deg so easier to view than the 90 deg ones shown but you would need a prism for this. Never seen a S/H one for sale but guess they must come up now and then.

Cornish Jack30/01/2017 23:44:21
879 forum posts
111 photos

Neil - scans sent as 4 .jpgs - hope they are OK

John F - The above item incorporates a home made prism and could, therefore be to any angle required.

rgds

Bill

Edited By Cornish Jack on 30/01/2017 23:44:47

Michael Gilligan30/01/2017 23:50:19
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12936 forum posts
555 photos

This is a very good place to buy prisms: **LINK**

http://surplusshed.com/search.cfm

Just put prism in the search box and have a browse.

Postal charges a very honest too [although USPS costs increased quite dramatically last year]

MichaelG.

Neil Wyatt31/01/2017 09:25:32
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Optical finder article now here:

www.model-engineer.co.uk/OpticalFinder

Thanks Bill.

Neil

Reg Rossiter31/01/2017 09:40:50
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17 forum posts

I use a laser edge / centre finder.

http://littlemachineshop.com/products/product_view.php?ProductID=2604

Reg

Peter Spink31/01/2017 22:22:52
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54 forum posts
14 photos
Posted by Journeyman on 30/01/2017 16:49:47:

This web article describes a home build centre finder using the inards of a cheap web cam, might be of use. Issue 121 of MEW

John

Edited By Journeyman on 30/01/2017 16:52:38

I built one of these three or four years ago. It's mounted on a 2MT arbour and the fiddly bit was getting the camera lined up with the axis of the mill. In conjunction with the DRO it is one of the most useful things in my workshop for edge finding, centring and measuring etc.

Even though the software is still available on the site, the chap that wrote the software is no longer supporting it.

Presumably an alternative would be the camera plug in on the Mach 3 software?

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