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7th July 2012, 07:12 PM #1SENIOR MEMBER
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Optical centre punch for 'simonl'
Hi Simon,
I have finally gotten around to taking the pics of the 'prototype' optical centre punch. The optic part is made from a perspex curtain pulling rod. It isn't the diameter I wanted but it served the purpose and proved that if I went to 1/2" this would work great. I cut a short piece and machined and polished the ends finishing with Brasso. I then set up the vernier height gauge to scribe the crosshairs. Next is a lump of steel with a hole drilled through the same size as the rod. The pics aren't great as I had a hard time getting a good view but you will get the drift. In real life the view is a lot clearer.
Phil
Attachment 214926 the two parts
Attachment 214927 The crosshairs
Attachment 214928 The parts assembled
Attachment 214930 A view on paper
Attachment 214931 A view on aluminium
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7th July 2012 07:12 PM # ADSGoogle Adsense Advertisement
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7th July 2012, 07:15 PM #2
Looking good Phil.
I have just cast some clear polyester rods, 19mm diam and about 125mm long, would they do the job?
If so let me know and I'll send you a couple.
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7th July 2012, 07:17 PM #3
Hi Phil,
Nicely done, but what is it's use? Once lined up do you drop a fitting center punch in and give it a tap to get precisely positioned marks?
A slightly puzzled Ewan1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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7th July 2012, 07:37 PM #4GOLD MEMBER
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Hi Phil,
I thought you had forgotten! Cheers. Like what Ewan said, I assume the process works by then dropping in an appropriately hardened centre punch?
Cheers,
Simon
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7th July 2012, 07:48 PM #5.
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7th July 2012, 08:25 PM #6GOLD MEMBER
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Hi Phil, Bob
So it relies on the light traveling down the perspex?
I see Bobs has an O-ring. To make it less likely to slide?
Nice one Phil, making one of theses has been on my list for awhile.
Stuart
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7th July 2012, 08:26 PM #7SENIOR MEMBER
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7th July 2012, 08:41 PM #8GOLD MEMBER
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Hi phil,
What level of accuracy with the centre punch would expect to obtain using this system?
Simon
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7th July 2012, 08:41 PM #9SENIOR MEMBER
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Ummm, when you guys get as old and feeble sighted as me you too will need some sort of visual aid to see a fine scribed line. I haven't made the centre punch yet as I will wait until I make the larger one which, thanks to Big Shed I can now make.
Hi Stuart,
It's the same as a bore light for a gun barrell and I have absolutely no idea what the 'O' ring is for in Bobs other than to stop it sliding when you use the centre punch.
Phil
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7th July 2012, 08:43 PM #10SENIOR MEMBER
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7th July 2012, 08:47 PM #11SENIOR MEMBER
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7th July 2012, 11:45 PM #12GOLD MEMBER
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Have you considered just using a light to see your marking out.
Then again if it needed to be accurate wouldnt you be better off using a mill or jig borer.
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7th July 2012, 11:50 PM #13.
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An indispensable tool
Ha Ha Phil,
My only criticism of the tool is the loud, untypically English OPTICAL CENTRE PUNCH emblazoned on the holder. Could have been restrained.
I have had it for about 15 years and it is in regular use. Used it this arvo. The O ring prevents slippage and marring of the work surface. The magnified image allows the use of faintly scribed lines. Lines that only need to scratch away the layout blue.
Peter,
My eyesight isn't flash these days. If I didn't have the finder I'd have to fool around with a jeweller's loupe and a centre punch. The finder is easy to use because you are looking vertically at the scribed intersection rather that at an angle with a loupe.
Bob.Last edited by Anorak Bob; 7th July 2012 at 11:59 PM. Reason: response to Peter's post
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8th July 2012, 12:21 AM #14GOLD MEMBER
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Hi Bob,
I brought the same brand unit a couple of months ago and they are more constrained on the engraving now. I would show a photo but not only is my eyesight failing so is my memory. I know it is in a safe place.
I had to rip eight full size sheets of that lovely MDF stuff today and moving everthing to make room around the table saw means the shed is in a bit more mess than normal.
Hard to balance between woodworking and metalwork in the same shed.Cheers,
Rod
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8th July 2012, 12:39 AM #15.
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