Geometry lesson time

1. ## Geometry lesson time

Examine the picture and you can see the issue. This is the "block true" plate that came with a SV85 I just came up with. I felt a need to check it for somee reason. As you can see it is not right.
I indicated the slot. It is parallel to the Y axis on my mill. I then indicated center from the bottom hole. This should put me in the centerline of the plate....right?? Right...
So, some A2 + B2 = C2 math can tell me what the measurement should be at x distance from the hole, right??
I need to make it right. Up to specs. I did not check the 2 edges to see if they were 90*. It is moot, since they are not the same height.
Thanks
Wags

2.

3. Mehh...what's a few thou between friends....
I think you're making life difficult on yourself by putting it in the machine like that. I'd have the two edges at X and Y...forget about trying to figure the trig. Indicate off the center hole, go X a certain dimension, go Y the same dimension. As long as you know that one edge is exactly 45* to the slot, and you indicate that edge into either X or Y, you should be GTG.

4. Whats that work out too? 2 RCHs. geez, my stock GM block flexes more than that at 7500. I'm happy if the block comes back and I can't measure the differences with a Stanley 25' tape.

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5.

6. Steel... that is the deal. I don't know if either edge is 45*.
I could easily see if they are 90* to each other. But I get lost from there. I could draw it out and do the math, but I am lazy. I figured some math whiz would know it off the top of their head.
The chic works for the state of IL. They have a fab dept with cnc stuff. Maybe I'll just send it with her and tell them to fix it.
Wags

7. don't you have a race to go to???

8. Originally Posted by bp298
don't you have a race to go to???
Nope. I quit that BS!
Wags

9. Originally Posted by wagspe208
Steel... that is the deal. I don't know if either edge is 45*.
I could easily see if they are 90* to each other. But I get lost from there. I could draw it out and do the math, but I am lazy. I figured some math whiz would know it off the top of their head.
The chic works for the state of IL. They have a fab dept with cnc stuff. Maybe I'll just send it with her and tell them to fix it.
Wags
Do you have a rotary table?

10. Originally Posted by wagspe208
Steel... that is the deal. I don't know if either edge is 45*.
I could easily see if they are 90* to each other. But I get lost from there. I could draw it out and do the math, but I am lazy. I figured some math whiz would know it off the top of their head.
The chic works for the state of IL. They have a fab dept with cnc stuff. Maybe I'll just send it with her and tell them to fix it.
Wags
To check the 45, all you need is indicate the edge @ x/y, and you should be able to go over and up equal amounts. Maybe with an edge finder...set the Y, come over on the X, touch the edge, go up 3.000" on the Y, you should come over 3.000" on the X and find the edge again if it's a true 45*. Does that make sense?

11. Originally Posted by wagspe208
Nope. I quit that BS!
Wags
uh huh...

12. I would rotate the plate on your table and reclamp such that the deck angles are parallel to your X and Y axis. Find the center of the hole, then the X and Y should be easy without the need for any math.

13. Originally Posted by lbhsbz
I would rotate the plate on your table and reclamp such that the deck angles are parallel to your X and Y axis. Find the center of the hole, then the X and Y should be easy without the need for any math.
The problem is that one of those surfaces has to be exactly 45* to the center slot (which should be pefectly centered on the hole). Checking 45* to the slot is the challenge. A rotary table would make it easy, or the "up and over" measurement.

14. Originally Posted by steelcomp
The problem is that one of those surfaces has to be exactly 45* to the center slot (which should be pefectly centered on the hole). Checking 45* to the slot is the challenge. A rotary table would make it easy, or the "up and over" measurement.

Yep. When I made my block truing fixture (with no CNC), that was my main obstacle to overcome.

Wags if you want to fix it yourself and have the capability to make new cones for the cam journals I can tell you how I made sure it was 45*. Since you have access to a CNC it might be easier to farm it out and have the ends trued.

15. No rotory table. I do see the indicate x and y and up and over. IF after indicating x, y is not also in line, that answers my 90* to one another issue. It will still take some work to verify the 45 to slot.
Wags

16. just curious.... did you check the surface between the deck areas (parallel with the valley area) to see if it was square with the slot?

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