I wouldn't have to. I'd bet they'd be wrong whether I knew it or notOriginally Posted by winchman
I wouldn't have to. I'd bet they'd be wrong whether I knew it or notOriginally Posted by winchman
Peter - novice home machinist, modern motorcycle enthusiast.
Denford Viceroy 280 Synchro (11 x 24)
Herbert 0V adapted to R8 by 'Sir John'.
Monarch 10EE 1942
Here is the answer I was looking for. It has been great revision for me and I have had considerable help from a mathematics forum.
The problem was to find the set-up angles required to make a skewed milling cut in a rectangular block following given angles on three of its surfaces.
The desired angles are A, B and C in planes YOZ, XOZ and XOY respectively. This is a right handed coordinate system with angles X -> Y, Y -> Z and Z -> X being +ve.
1. Align vice jaws // X.
2. Set block in vice so that line at angle A is // to XOY
3. Tilt vice by angle D to XOY. Where
D = atan(cosAtanB)
4. Rotate vice by angle E from XOZ. Where
E = atan(cosAsinC/(cosCcosD-sinAsinCsinD))
John.
Mark out the OP's job (as per his pic - here):
Put it in a 3-axis vise like this:
Put the vise on a flat plate and use a surface guage or a height guage
- like this:
http://i200.photobucket.com/albums/a...faceguage4.jpg
Or a variation like this:
and set the three axis until the lines on the job are parallel to the mill table.
More variations on a theme (no maths needed here either):
Thanks for the many ways to do it if you have the equipment.
You can leave the base of the vise flat on the mill table. Turn the vise to the first angle and clamp to the table. Put an angle block of the correct angle under the part to tilt it sideways in the vise jaws and then tilt the vise for the final angle.
Darn... now I have to clean coffee off of my key board........ I have done that before... and had inspection make the same mistake... only on assembly did they find out it was wrong....Originally Posted by winchman
There are only two angle to figure... Tilt and rotate. Use a common leg, the angle you are cutting as the lenght of 1 and work from that. It really is simple.