Sibley

[andyh1956]

Greetings from Mississippi! Been reading here for a Long Time but this is my 1st post!
Gotta question about an old Sibley Camelback I have. How do I measure what "Size" it is? I see DPs measured as 20" or maybe 18" but where is this measured at?
Sometime before the holidays I'm gonna drag this DP outta it's corner & clean it up & see if somebody may want it & would like to be able to tell them what "Size" & model it is!
Thanks!
Andy

 

[bmwrd0]

The size is usually determined by how large a circle can be drilled in the center of. This is called the swing.

 

[RTM]

In other words, distance from the drill tip to the nearest obstruction on the frame.

Is it radius or diameter. I've always used radius.

 

[andyh1956]

Oh OK I'm good with a Radius!
Thanks!