Geometry lesson time
+ Reply to Thread
Page 1 of 3 1 2 3 LastLast
Results 1 to 14 of 29

Thread:
Geometry lesson time

  1. #1
    Senior Member wagspe208's Avatar
    Join Date
    Apr 2008
    Location
    waterloo
    Posts
    2,034

    Default 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
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	blocktrue.jpg 
Views:	44 
Size:	88.9 KB 
ID:	162519  

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    steelcomp was here
    Join Date
    Dec 2007
    Location
    n/e TN
    Posts
    26,275

    Default

    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.
    Last edited by scott foxwell; 05-30-2012 at 07:49 PM.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  4. #3
    gn7
    gn7 is offline
    Senior Member gn7's Avatar
    Join Date
    Jan 2008
    Posts
    25,975

    Default

    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.



    100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Senior Member wagspe208's Avatar
    Join Date
    Apr 2008
    Location
    waterloo
    Posts
    2,034

    Default

    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. #5
    Senior Member bp298's Avatar
    Join Date
    Dec 2007
    Location
    LHC
    Posts
    6,573

    Default

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

  8. #6
    Senior Member wagspe208's Avatar
    Join Date
    Apr 2008
    Location
    waterloo
    Posts
    2,034

    Default

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

  9. #7
    steelcomp was here
    Join Date
    Dec 2007
    Location
    n/e TN
    Posts
    26,275

    Default

    Quote Originally Posted by wagspe208 View Post
    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?
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  10. #8
    steelcomp was here
    Join Date
    Dec 2007
    Location
    n/e TN
    Posts
    26,275

    Default

    Quote Originally Posted by wagspe208 View Post
    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?
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  11. #9
    Senior Member bp298's Avatar
    Join Date
    Dec 2007
    Location
    LHC
    Posts
    6,573

    Default

    Quote Originally Posted by wagspe208 View Post
    Nope. I quit that BS!
    Wags
    uh huh...

  12. #10
    Senior Member lbhsbz's Avatar
    Join Date
    Oct 2008
    Location
    Long Beach
    Posts
    1,617

    Default

    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. #11
    steelcomp was here
    Join Date
    Dec 2007
    Location
    n/e TN
    Posts
    26,275

    Default

    Quote Originally Posted by lbhsbz View Post
    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.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  14. #12
    Senior Member earlbrown's Avatar
    Join Date
    Dec 2007
    Location
    LaGrange GA
    Posts
    285

    Default

    Quote Originally Posted by steelcomp View Post
    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. #13
    Senior Member wagspe208's Avatar
    Join Date
    Apr 2008
    Location
    waterloo
    Posts
    2,034

    Default

    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. #14
    Senior Member earlbrown's Avatar
    Join Date
    Dec 2007
    Location
    LaGrange GA
    Posts
    285

    Default

    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?

+ Reply to Thread
Page 1 of 3 1 2 3 LastLast

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Please select your insurance company (Optional)

Log-in

Tags for this Thread

Digg This Thread

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •  
 

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95