|John McNamara||07/01/2012 13:34:34|
1341 forum posts
Cylindrical squares have many practical uses.
In the setup below I needed to bore two holes at 90 deg to the two slide rods
Two cylindrical squares were first bolted to the table then the work clamped to them
some packing under the work to make it parallel to the table and the setup was done.
(I drilled then bored)
The second square is at the back and a little hard to see.
1936 forum posts
That parallels almost exactly my experience in inspection during my apprenticeship.
One question regarding the use of cylindrical squares. How would one check the internal angle of the square? Is it sufficient to correct the external angle and then check the parallelism of the stock and blade? Or is there another method I'm missing here?
It is the internal angles which are most useful for marking out in benchwork (both inner and outer side of blade) and these are what the flip over against a straight edge tests.
Edited By Terryd on 07/01/2012 14:52:00
1936 forum posts
in the 'flip over' test there are three to be carried out. First outer angle against outer angle which proves the angle correct at 90 . Then inner angle against inner which if satisfactory proves the parallelism and as a final check, inner against outer. Surely that automatically checks and confirms (or otherwise) parallelism of the blade. A long , shallow upright can then be clamped to your test edge and the outer part of the stock can be compared to the previous tests, or then use the cylindrical square to test the outer angle of stock/blade.
Edited By Terryd on 07/01/2012 14:51:35
|Douglas Johnston||07/01/2012 16:01:55|
773 forum posts
One thing I would like to see is the use of stainless steel for squares and other similar measuring equipment. I bought a stainless square a couple of years ago which looks like the Warco one mentioned earlier and it is a joy to use since it is very well made and does not need to be oiled to prevent rust.
The problem is the range of stainless items is very limited. The largest square I can find is only 100mm and I would like a larger one. If we can get dirt cheap hardened stainless steel calipers, why can't we get other measuring stuff in this material?
|Russell Eberhardt||04/02/2012 10:48:53|
2751 forum posts
A cheap source of cylindrical squares is old gudgeon pins from a car scrapyard. I have a pair of Rover 2000 ones that I have used for years. They are precision ground to a couple of tenths under 1" dia. and just under 3" long. I'm sure something bigger could be found from a truck.
|Mike Poole||02/03/2019 21:55:16|
3373 forum posts
I spotted on eBay hard chromed piston rod for hydraulic cylinders up to 70mm diameter, not exactly cheap but a short length could make a couple of squares just for the trouble of facing the ends square. I would hope they are parallel and round to better than I could make. If you make two then they can check each other.
|David George 1||03/03/2019 09:17:45|
1869 forum posts
I have three cylindrical squares made when I was an apprentice. I wouldn't be without them but I have two Moor and Wright blade squares of similar age which get used very frequently. I also have a Starrett square set of centre finder and protractor.
6603 forum posts
This seems to be the way to go very frequently. If you can find older tools and equipment still in good condition, as much of it is, even after 50 years or so. I've bought garage-sale M&W squares for $2 a pop that are still as good as new in use. Others that you see have obviously been knocked around, used do drive in nails etc (I kid you not!) and are best left alone.
|Nicholas Farr||03/03/2019 13:32:37|
3413 forum posts
Hi, unless you feel you need a good solid hammer to knock the nails in square!
As Russell suggests, I have had for a long time now, a few gudgeon pins from a lorry engine or two, that are in good nick
|3562 forum posts|
Cutwel sell hardened stainless steel squares up to 300mm x 200mm (usual disclaimer)
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