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.
|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
1808 forum posts
If they do still exist I would imagine a decent quality one would be many times the price of a DRO system.
|44 forum posts|
Something similar was discussed back in 2015:
|3064 forum posts|
What do you mean by "fairly accurate"? Define the problem and layout.
|Roderick Jenkins||30/01/2017 15:56:11|
1720 forum posts
Perhaps something like this **LINK**
|11 forum posts||
1808 forum posts
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.
581 forum posts
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
Edited By Journeyman on 30/01/2017 16:52:38
261 forum posts
|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!
|Rik Shaw||30/01/2017 17:38:06|
1253 forum posts
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.
|Cornish Jack||30/01/2017 17:48:39|
|879 forum posts|
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! 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! 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.
|Tractor man||30/01/2017 18:04:45|
|426 forum posts|
|Centre scope but a costly item to ensure accuracy as a one off. Mick|
|Neil Wyatt||30/01/2017 22:02:05|
15831 forum posts
Tell you what, send me a scan of it and I'll put it up on the website
|62 forum posts|
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.
784 forum posts
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.
|Cornish Jack||30/01/2017 23:44:21|
|879 forum posts|
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.
Edited By Cornish Jack on 30/01/2017 23:44:47
|Michael Gilligan||30/01/2017 23:50:19|
12936 forum posts
This is a very good place to buy prisms: **LINK**
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]
|Neil Wyatt||31/01/2017 09:25:32|
15831 forum posts
Optical finder article now here:
|Reg Rossiter||31/01/2017 09:40:50|
17 forum posts
I use a laser edge / centre finder.
|Peter Spink||31/01/2017 22:22:52|
54 forum posts
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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