What’s Is The Angle

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What’s Is The Angle

This topic has 10 replies, 7 voices, and was last updated 10 July 2022 at 19:26 by JasonB.

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9 July 2022 at 15:32 #605101
Harry Wilkes
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@harrywilkes58467
A friend of mine has offered to machine a casting for my 3" Burrell clack, I have a drawing but the angle is not marked. We thought we could use the same angle as the print but my friend say's is he did use that angle the foot ( the part that bolts to boiler) of the clack would not be of equal thickness. Anyone machined one of these and can remember what angle they used or suggestion please

H
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9 July 2022 at 15:32 #28765
Harry Wilkes
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@harrywilkes58467
9 July 2022 at 15:38 #605104
duncan webster 1
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@duncanwebster1
Looks like arcsin (1.5/3) to me which is 30 degrees. Hopefully someone will confirm before you cut metal.
9 July 2022 at 15:42 #605105
JasonB
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@jasonb
9 July 2022 at 15:46 #605106
KWIL
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@kwil
The drawing clearly shows 30 degrees at point of contact with the 1/8" hole..

From your question it appears the casting may not a good one or you have to fettle it to give a equal thickness foot?
9 July 2022 at 21:33 #605160
Harry Wilkes
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@harrywilkes58467
Thanks everyone

H
10 July 2022 at 15:50 #605251
old mart
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@oldmart
Don't forget to write 30 degrees on the drawing rather than relying on the obscure 3" rad and the 1.5" height.
10 July 2022 at 17:03 #605255
Nicholas Farr
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@nicholasfarr14254
Hi, I know it's been answered, but just to confirm Duncan Webster's answer; 1.5/3 equals 0.5, which is 30 in the Natural Sine table, or on your calculator with Trig function, 1.5 / Sin 30 = 3, or 3 x Sin 30 = 1.5

Regards Nick.
10 July 2022 at 17:53 #605268
SillyOldDuffer
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@sillyoldduffer
Posted by old mart on 10/07/2022 15:50:27:

Don't forget to write 30 degrees on the drawing rather than relying on the obscure 3" rad and the 1.5" height.

I agree! I know it's bad practice to duplicate dimensions on drawings unnecessarily, but the radius and height method seems cryptic to me. Writing 30 degrees on the plan would have been kind to this Bear of Little Brain!
10 July 2022 at 18:53 #605273
old mart
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@oldmart
The hole is at 30 degrees, but the face shown is curved to match that radius, so both sets of figures are important.

I cannot see where that curved face should end up relative to the rest of the drawing, somebody show me, please. Is it relative to the 5/8" dimension from the centre bore?

Edited By old mart on 10/07/2022 18:55:50

Edited By old mart on 10/07/2022 18:57:33
10 July 2022 at 19:26 #605279
JasonB
Moderator
@jasonb
It is a lot easier to mark the position of that component on the side of the boiler either by locating the top or ctr line and then scribing a line 1.5" up or down. Not so easy to work out the radial position of 30 deg. from the "open" middle of a copper tube.

Also the x and y positions allow you to set a boring head to the correct relative position to te casting so you can cut the convex flange

It would make more sense if you saw the curved flange just out of view on the right that allows the clack to be fixed to the radius of the boiler.

Edited By JasonB on 10/07/2022 19:31:28
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