(DIR) Return Create A Forum - Home --------------------------------------------------------- Chainsaw Repair (HTM) https://chainsawrepair.createaforum.com --------------------------------------------------------- ***************************************************** (DIR) Return to: Chainsaw Collection Pics - Signs - Whats on your be... ***************************************************** #Post#: 77697-------------------------------------------------- Re: Whats on your bench today By: chy_farm Date: June 10, 2017, 8:24 pm --------------------------------------------------------- [quote author=3000 FPS link=topic=1732.msg77696#msg77696 date=1497138077]---I have a few questions. 1) The RPM's you chose is 10,000 rpm. Is that based on what the saw will turn in the wood or with out a load with bar and chain on. 2) What gauge sheet metal are you using to build the pipe. 3) Are you gas welding the Pipe together. [/quote] Thank you 3000FPS for having interest on this. (1) I previously posted two ways for the trial designing, one for 9600 and the other for 10000rpm, [quote author=chy_farm link=topic=1732.msg77690#msg77690 date=1497048560] E.g. I put below factors; Velocity of Rotation : 9600 rpm Exhaust Gas Temperature : 653 degrees K ( equivalent to 380 degrees Celsius) [/quote] I chose the first design for this, so the rotation will be 9600 when this pipe exerts its maximum effect to the exhaust gas. According to Mike's site, Chainsaw Collectors Corner, this series of McCulloch show their spark timing as 26 degrees in advance. To my understanding this means their maximum rotation speed can be limited to not more than 10000, since this timing makes the motor unable to release its detonation heat outside of the cylinder chamber. This assumption leads me to set the maximum velocity of rotation to 9600. So as an answer to this I would say yes it's should be the optimized speed and power of the saw running in wood. Calculation tells but I am not very sure until I try her in some wood, lol. (2) The gauge for sheet metal in this area is given by metric system, so the thickness I use for pipes are 0.5mm and 0.8mm for the body of pipe, sometimes 1.0mm for holder/stay attached to it. The quality is they call High Tension Steel Sheet, mostly for car body. This sheet with 0.5mm thick is easy to use, you may easily roll them to pipes and corns with hands, also with hammers sometimes. Incidentally I use a simple roll bender for my pipe project, which is also my hand-made. (3) Yes for this project. But for the latest project I did for Echo Twin, I made them separate. The latter half of the pipe or the reflector part can be removed at the center joint. See a pic here. Chy #Post#: 77700-------------------------------------------------- Re: Whats on your bench today By: chy_farm Date: June 11, 2017, 7:33 am --------------------------------------------------------- It was a nice Sunday today, fine 23degrees Celsius and 35% moisture. Did some more fabrication this afternoon. #Post#: 77701-------------------------------------------------- Re: Whats on your bench today By: HolmenTree Date: June 11, 2017, 11:30 am --------------------------------------------------------- That's a beautiful project saw you're building Chy!! If McBob saw that he would be wishing he could comment on it here. #Post#: 77704-------------------------------------------------- Re: Whats on your bench today By: chy_farm Date: June 11, 2017, 4:44 pm --------------------------------------------------------- [quote author=HolmenTree link=topic=1732.msg77701#msg77701 date=1497198607] That's a beautiful project saw you're building Chy!! If McBob saw that he would be wishing he could comment on it here. [/quote] Good morning and thanks HolmenTree, you are exactly right, yes he shot me a video on Facebook, see this a fun thing to see. (HTM) https://www.youtube.com/watch?v=5Qp0EYPZd_0&t=25s #Post#: 77715-------------------------------------------------- Re: Whats on your bench today By: chy_farm Date: June 13, 2017, 3:31 am --------------------------------------------------------- [Designing a reflector] In the same manner I did in previous case, Echo Twin, drew lines on a sheet metal. Assembled and welded. A pressure test was given but unfortunately some holes were found on the seam lines. #Post#: 77723-------------------------------------------------- Re: Whats on your bench today By: chy_farm Date: June 13, 2017, 6:09 pm --------------------------------------------------------- Pressure test passed! #Post#: 77724-------------------------------------------------- Re: Whats on your bench today By: 3000 FPS Date: June 13, 2017, 7:56 pm --------------------------------------------------------- Looks good Chy. Now for the performance side of it. #Post#: 77734-------------------------------------------------- Re: Whats on your bench today By: chy_farm Date: June 14, 2017, 8:14 am --------------------------------------------------------- Thanks 3000 FPS, now I am pondering how to make a performance test without a log that fits to her power, lol. You may not believe this but it is true though here. I used to have a nice farm here and had some twenty year old pine trees until I terminated it four years ago. Nice reminiscing with the saws in my shed now, but actually I want some other methods to test them without logs. You may laugh at me but I have been thinking of a homemade unit for my saws, appreciate your information about some designs for it. Chy #Post#: 77744-------------------------------------------------- Re: Whats on your bench today By: chy_farm Date: June 15, 2017, 8:30 am --------------------------------------------------------- Found one here thanks. (HTM) https://www.youtube.com/watch?v=Qiv1-j3evd4 #Post#: 77748-------------------------------------------------- Re: Whats on your bench today By: Chainsawrepair Date: June 15, 2017, 1:55 pm --------------------------------------------------------- Has to be one of the better pipes I have seen built for a mac so far. WTG ***************************************************** (DIR) Previous Page (DIR) Next Page