Advice in Compass Making

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Hi to you all, I have a job in an ammonia refrigeration system, the insulation on the pipes was to be changued.. Long story short... I came to the moment of making the valves jakets. Elbows and Tees. So, I need a compass o well... maybe more... So i was cheking some videos and I like a desing in a Canadian Institute.,... So I decide to make mine... This is the first try.. I think it came pretty well I dont like much the material (Mild steel) it bows a litte bit... on the small circles. So I need some ideas for improve this and the next I will need. (I know may be there is a store to buy this... but at current time I havent found one) So, I hope have write this rigth...
Reply:Use google "product search" and buy an already made compass.Lincoln Power Mig 216Lincoln AC/DC-225/125Miller  625 X-Treme PlasmaMiller 211 Forney 95FI-A 301HF 91110Victor Journeyman O/PMilwaukee DaytonMakita  Baileigh NRA Life Member
Reply:they are made of a harder /spring type of steel so they wont flex as much
Reply:Many old-timers started with far worse.  It looks like you made a set of calipers instead of a compass though.
Reply:[ame]http://www.youtube.com/watch?v=E8kzMTHLTzk[/ame]Popular Woodworking sells the full DVD on how to make these.http://www.popularwoodworking.com/wo...d-irregularityLast edited by DSW; 04-26-2013 at 10:14 AM..No government ever voluntarily reduces itself in size. Government programs, once launched, never disappear. Actually, a government bureau is the nearest thing to eternal life we'll ever see on this earth! Ronald Reagan
Reply:That YouTube video is a tease!!  I now have to save up for the DVD.
Reply:Hello AlexLPD, here is an example of a beam trammel that I built a lot of years back. It utilizes carbide threaded scribe tips and fits onto a 3/8" X1" flat bar, I use aluminum stock. I also have a number of different lengths of beams that I use this with. The smallest circle that it will currently scribe is about 3/4". If I had machined the threaded hole in the trammel points off-center and closer to the edge of each trammel body I could have probably gotten an even smaller circle scribing capability. Good luck and best regards, Allan Attached Imagesaevald
Reply:I have a couple beam trammels.
Reply:Originally Posted by aevaldHello AlexLPD, here is an example of a beam trammel that I built a lot of years back. It utilizes carbide threaded scribe tips and fits onto a 3/8" X1" flat bar, I use aluminum stock. I also have a number of different lengths of beams that I use this with. The smallest circle that it will currently scribe is about 3/4". If I had machined the threaded hole in the trammel points off-center and closer to the edge of each trammel body I could have probably gotten an even smaller circle scribing capability. Good luck and best regards, Allan
Reply:This is very impressive.... Than you very much!  Originally Posted by DSWPopular Woodworking sells the full DVD on how to make these.http://www.popularwoodworking.com/wo...d-irregularity
Reply:Yes its the first attemp, I dont have a forge rigth know... so I heated up with the good old oxy-torch, put in the bender and cut the ends with a cut disc, the points were filed ..Thank you !  Originally Posted by mstyerMany old-timers started with far worse.  It looks like you made a set of calipers instead of a compass though.