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Bolt hole circle
In G-code programming, the parameters to the bolt hole circle (bhc)
procedure are radius, angle from vertical to first hole, and number of holes. My point is that when anyone but a cyclist talks about a bhc, he or she universally specifies a *radius*, not a diameter. So, a 110 bhc should be 55!!! Jones |
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Bolt hole circle
In article ,
!Jones wrote: In G-code programming, the parameters to the bolt hole circle (bhc) procedure are radius, angle from vertical to first hole, and number of holes. My point is that when anyone but a cyclist talks about a bhc, he or she universally specifies a *radius*, not a diameter. So, a 110 bhc should be 55!!! Jones Well, that's fair, but the actual most useful in-the-field measure, as Sheldon points out somewhere, is the distance from bolt to bolt for a given BCD and bolt pattern*. Bolt-bolt centres are an easy thing to measure, while the diameter is hard to directly measure. Also, BCD feels relevant to cyclists because it constrains the smallest number of teeth a ring on that bolt circle can have (about 39 for 130 mm BCD, barring heroic efforts). *bolt pattern being a distinction that was hardly necessary until the advent of 4-bolt MTB cranks -- Ryan Cousineau http://www.wiredcola.com/ "I don't want kids who are thinking about going into mathematics to think that they have to take drugs to succeed." -Paul Erdos |
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Bolt hole circle
On Fri, 28 Sep 2007 04:56:21 GMT, in rec.bicycles.tech Ryan Cousineau
wrote: Well, that's fair, but the actual most useful in-the-field measure, as Sheldon points out somewhere, is the distance from bolt to bolt for a given BCD and bolt pattern*. Oh, I agree. If I ever had to solve a BHC, I'd start with that as the easiest measurement to take; then I count the holes and pull out my calculator. My point is that, mathematically, a circle is defined by a radius. I was cutting a chain ring the other day and I accidentally plugged in 110 is what brought it to mind. I hadn't ever really thought about it, but we're the only bunch I know of to use a diameter. Jones |
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Bolt hole circle
On Sep 27, 9:43 pm, !Jones wrote:
In G-code programming, the parameters to the bolt hole circle (bhc) procedure are radius, angle from vertical to first hole, and number of holes. My point is that when anyone but a cyclist talks about a bhc, he or she universally specifies a *radius*, not a diameter. So, a 110 bhc should be 55!!! Jones But cyclists don't talk about BHCs. They talk about BCDs. |
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