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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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layout question - bolt hole pattern
I need some guidance on figuring out what the bolt hole co-ordinates
are to build a drive flange. The hub I need to bolt to has three holes, evenly spaced with a center to center dimension of 3.607. How do I calculate what the bolt hole x-y co-ordinates are to drill this when held in the mill vice? thanks in advance, ron |
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On 2 Oct 2005 06:42:00 -0700, wrote:
I need some guidance on figuring out what the bolt hole co-ordinates are to build a drive flange. The hub I need to bolt to has three holes, evenly spaced with a center to center dimension of 3.607. How do I calculate what the bolt hole x-y co-ordinates are to drill this when held in the mill vice? thanks in advance, ron http://www.darex.com/calipers/ Randy |
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In article , Bruno says...
No trig needed on this one... ... Divide that by sqtr(3) gives the Y coordinate. Oops, that's trig! Still works though... Jim -- ================================================== please reply to: JRR(zero) at pkmfgvm4 (dot) vnet (dot) ibm (dot) com ================================================== |
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OK, what I should have said was... no trigonometric functions used.
-Bruno jim rozen wrote: In article , Bruno says... No trig needed on this one... ... Divide that by sqtr(3) gives the Y coordinate. Oops, that's trig! Still works though... Jim |
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wrote: I need some guidance on figuring out what the bolt hole co-ordinates are to build a drive flange. The hub I need to bolt to has three holes, evenly spaced with a center to center dimension of 3.607. How do I calculate what the bolt hole x-y co-ordinates are to drill this when held in the mill vice? thanks in advance, ron This is what a shop computer is for.......... Check here for a bunch of indispensable little programs that keep you from frying your brain: http://www.geocities.com/CapeCanaveral/Hall/4425/ Tom ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
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On Sun, 02 Oct 2005 15:37:28 GMT, Bruno wrote:
wrote: I need some guidance on figuring out what the bolt hole co-ordinates are to build a drive flange. The hub I need to bolt to has three holes, evenly spaced with a center to center dimension of 3.607. How do I calculate what the bolt hole x-y co-ordinates are to drill this when held in the mill vice? thanks in advance, ron No trig needed on this one... I assume an equilateral triangle... the holes at each point at 12:00, 4:00 and 8:00. Based in the center of the bolt hole pattern, I first calculated the triangle for the 4:00 hole by drawing a triangle with the hypotenuse as the line from the hole to the center. It's a classic 30-60-90. We know the X value is 1/2 the hole to hole distance (3.607 / 2 = 1.8035). Divide that by sqtr(3) gives the Y coordinate. The 8:00 hole has the same Y and negative X coordinate. For the 12:00 hole, I make another triangle with the hypotenuse from the 4:00 hole to the 12:00 hole. Another 30-60-90 where the height is 1.8035 time sqrt(3) and then we subtract out the Y of the other holes to get the Y off center. So, the coordinates based on center are... 0, 2.0825 -1.8035, -1.04125 +1.8035, -1.04125 -Bruce Oops. Bruce is right. I use a bolt circle of 3.607 dia rather than center-to-center distance of 3.607. |
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wrote:
Thanks to everyone who helped me on and off the list. I will try to wrap this old farts brain around the math... been awhile since I used that calculator! If anyone can quickly crunch the numbers on my second project which uses a 1.469 bolt center to center distance that would be terrific. I am trying to learn, just takes a bit sometimes. You can lay out the x-y co-ordinates such as several did, including either way that Brian Lawson provided the data. Thank you again, this is a truely great group of minds, ron Try this Program out might be the easy answer http://iwr.ru.ac.za/~iwdf/lathe/pcd.html |
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Thanks to everyone who helped me on and off the list. I will try to
wrap this old farts brain around the math... been awhile since I used that calculator! If anyone can quickly crunch the numbers on my second project which uses a 1.469 bolt center to center distance that would be terrific. I am trying to learn, just takes a bit sometimes. You can lay out the x-y co-ordinates such as several did, including either way that Brian Lawson provided the data. Thank you again, this is a truely great group of minds, ron |
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Assuming you're still doing a three hole pattern, the following are
based on 0,0 being the center point of the pattern. X = 0, Y = .8481 X = -.7345 Y= -.4241 X = +.7345 Y= -.4241 Someone will verify my math, I'm sure. -Bruno wrote: Thanks to everyone who helped me on and off the list. I will try to wrap this old farts brain around the math... been awhile since I used that calculator! If anyone can quickly crunch the numbers on my second project which uses a 1.469 bolt center to center distance that would be terrific. I am trying to learn, just takes a bit sometimes. You can lay out the x-y co-ordinates such as several did, including either way that Brian Lawson provided the data. Thank you again, this is a truely great group of minds, ron |
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Thanks again, that has my projects rolling.
Alot of the programs, BOLTCIRC & the latest one that Micheal Allard brought to attention are wonderful if the bolt circle radius is known, but unless I am missing something critical here, when you only have the center to center dimensions for the layout, then you are back to doing the math by hand, or using an AUTOCAD type program. Is that statement correct? thanks again all, ron |
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On 4 Oct 2005 07:28:48 -0700, wrote:
Thanks again, that has my projects rolling. Alot of the programs, BOLTCIRC & the latest one that Micheal Allard brought to attention are wonderful if the bolt circle radius is known, but unless I am missing something critical here, when you only have the center to center dimensions for the layout, then you are back to doing the math by hand, or using an AUTOCAD type program. Is that statement correct? thanks again all, ron The center-to-center distance is referred to as the 'chord'. If that's known, then calculate the 'angle' between adjacent bolt holes as: angle = 360 / (number of bolt holes) Then the bolt circle radius is given by: radius=0.5*chord/sin(0.5*angle) Regards, Marv Home Shop Freeware - Tools for People Who Build Things http://www.geocities.com/mklotz.geo |
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