Boat Design Forums  |  Boat Design Directory  |  Boat Design Gallery  |  Boat Design Book Store  |  Thanks to Our Site Sponsors
Old 03-12-2017, 09:17 PM
rtrg rtrg is offline
Join Date: Jul 2011
Rep: 10 Posts: 2
Location: stratford ct
elbow drafting machine

I saw a drafting discussion here which is why I am here. Simple question. How do I determine the board coverage of an arm type based on scale length, arm length, arm swing, and clamping spot? I see arms in the 15 to 24 inch range, and scales from 12 to 18 inches long. There are very few that have any indication that coverage is less than typical. Such as "JR", MINI, SHORT or others. I need coverage no more than 24 x 24. Probably less. A vintage DIETZGEN 1930's with arms of 15 and 20 is clamped to its own board that can be closed and stored in a draw. A3 size? Formula would be nice or a simple chart. Thanks.
Reply With Quote
Old 03-12-2017, 09:36 PM
jehardiman jehardiman is online now
Senior Member
Join Date: Aug 2004
Rep: 2040 Posts: 2,254
Location: Port Orchard, Washington, USA
Arm length is not as important as scale length,,,So max width is U arm +L arm+ scale. Lower corner is U arm+ L arm * sqrt (2/2)>>0.707+SCALE
A vessel is nothing but a bunch of opinions and compromises held together by the faith of the builders and engineers that they did it correctly. Therefor the only thing a Naval Architect has to sell is his experiences.
Reply With Quote
Old 03-13-2017, 08:28 PM
rtrg rtrg is offline
Join Date: Jul 2011
Rep: 10 Posts: 2
Location: stratford ct
please state again in more simple terms. also tell me if clamping location along top edge is or is not a factor. I would rather have short arms/scales for less coverage than the typical 3 x 4 foot or larger coverage.
Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Similar Threads
Thread Thread Starter Forum Replies Last Post
on-line source for Cummins 4BT wet exhaust elbow Northeaster Diesel Engines 19 12-06-2013
07:10 PM 
Volvo MD 3B exhaust elbow...source FAST FRED Diesel Engines 1 06-18-2009
06:21 AM 
Drafting Machine Question jacks-davis Education 17 02-27-2004
09:03 PM 
proper care and feeding of your drafting machine 8knots All Things Boats & Boating 9 02-19-2004
08:24 PM 
Drafting Machine for sale Lone Star 2 Marketplace 0 01-22-2004
02:33 PM 

Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.

All times are GMT -5. The time now is 03:30 PM.

Powered by: vBulletin Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Web Site Design and Content Copyright ©1999 - 2017 Boat Design Net