Gallery, Projects and General > How do I??
which tool to set up a piece to an angle?
ariz:
many thanks to all of you
fortunately I posted this question, and mklotz reply made possible for me to save some money: I wanted to buy the adjustable angle block (option 3) just because it appears beautiful to see, so shiny :doh:
but now that I watch better, the marks of that scale are really coarse, the entire range confined in a small space
I haven't problems in making my own tools, instead I like it very much
but probably I'll go with option 2, a box of angle blocks. unfortunately I see them only in the USA, nobody in Europe sell them...
thank you again
bogstandard:
With the little digi jobs, you have to be rather careful. the base isn't actually flat, but recessed in the middle, so for short parts, I mount it first onto a parallel, then set it up and use it. I think I mentioned them in a post I am working with, they are fine for run of the mill stuff, but because their lack of finer measuring are no use for critical working.
As Marv says, the sine bar is really the way to go if you want good support and accurate angles. Also, unlike what some people think, you don't have to be a genious to use one, if I can, anyone can.
In fact I had a cheapo 2.5" sine bar delivered yesterday, brand new, less than 6 squid (plus tax and post of course), and it is perfect for the rough and tumble of the workshop. Throw it away when it gets too battered, and then buy another.
http://www.mscjlindustrial.co.uk/SIMAY-10055C/product.html
Chronos sells the angle blocks
http://www.chronos.ltd.uk/cgi-local/sh000001.pl?REFPAGE=http%3a%2f%2fwww%2echronos%2eltd%2euk%2facatalog%2findex%2ehtml%3fhttp%253A%2f%2fwww%2echronos%2eltd%2euk%2facatalog%2fcatalogbody%2ehtml%26CatalogBody&WD=block%20set%20angle&PN=Chronos_Catalogue_Squares___Rules___Angle_Gauges___Parallels___Other_Measuring_Tools_206%2ehtml%23a53666021#a53666021
John
mklotz:
Worst comes to worst, you can make your own sine bar.
While it's convenient to have the distance between rolls a nice even number, like 2.5 or 5 inches, it isn't a requirement. All that really matters is that the two rolls are parallel - something not too hard to achieve in the home shop equipped with a mill.
Once the rolls are installed, the distance between them can be found with the aid of any precision angle block (beg the use of one from a fellow hobbyist). Put the angle block on the sine bar and jack up the sine bar with an adjustable parallel until the a DTI swept across the angle block shows no movement.
Then:
theta = angle block angle
p = height of adjustable parallel
d = distance between rolls on sine bar
d = p/sin(theta)
Once you've calculated d, scribe its value into the bottom of the sine bar and use it to calculate the stack height needed for any angle you wish to set.
p = d * sin(desired angle)
John Hill:
I had only heard a little of sine bars and had no knowledge until now, scheesh they sure do look like a clumsy way of going about it?
Yorkshireman:
I once needed to setup a piece in a rather funny angle in a tight space...
look here (in German, though)
http://www.dampfbahner.net/wbb2/thread.php?threadid=1347
Johannes
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