Gallery, Projects and General > Project Logs
a nine cylinder radial engine, plans by "ageless engines"
zeroaxe:
Thanks for the video. I get it now. However, I have yet one more question.... Why would one not use a milling machine instead of the shaper?
Bernd:
That shaper was the fore runner of the mill. But therre are some things you can do with a shaper that you can't on a mill.
Bernd
Darren:
--- Quote from: zeroaxe on March 18, 2010, 05:59:50 PM ---Thanks for the video. I get it now. However, I have yet one more question.... Why would one not use a milling machine instead of the shaper?
--- End quote ---
http://madmodder.net/index.php?topic=2830.msg30273#msg30273
madjackghengis:
Thanks 'drilling, I appreciate the video, I could do it if I knew how, but your's shows it so well. And Bernd, thanks for your statement, in fact, the welding of the raw stock together, and the coprocessing of the cheeks is intended to make it easy to align the crank in its tight place when finished, and a shaper gives a more accurate straight line cut than an equally tight and good working mill, so the sides of the cheeks are exactly parallel and perpedicular to the faces. The shaper also does faster heavy cutting with cheaper tool bits, and the cutters are easily ground back sharp on the grinding wheel, no special tool sharpening needed as there is for milling cutters.
Having broken the last of my valve seat cutter inserts, broken the valve guide of the head at the same time, I gave up on my work for the day yesterday, and decided to do something I knew would come out all right, and would take up the last bit of my time: the crank pin.
the crank pin is an inch and three eighths long with the bearing surface .875 long, .5625 diameter, with the stubs turned to match the pin holes in the crank cheeks or webs, turned down to .395 for a moderate press fit. At least one end must not be permanent, if the crank is ever to be removed, so these two joints, when finished, will be cross pinned with taper pins with the rear one removeable, as it has little power taken off it, only to drive the distributor and air impeller.
the crank pin is tighter fit to the front, prop shaft cheek, as this will have power taken from it
another view of the partially completed crank
another view of the crank to put the pieces into perspective. If I have time after seeing the doctor today, I may get the rear shaft made, and perhaps at least some of the final oil holes drilled. The main ones are drilled, it is only the connecting ones, which must be done with the shaft completely together, which have not been drilled yet. Soon to be working on a master rod, I can hardly wait for that. The crank shaft makes me happy :beer: mad jack, all the interest keeps me motivated, and I will master taking videos soon, because I'm going to show it running as soon as I can get there!!! :clap: :nrocks: :ddb: Thanks all!!!
NickG:
When I first got into model engineering people told me that shapers were old hat, slow etc and that milling machines had pretty much taken over, infact we cut one up and scrapped it at our club a few years back. But since joining this forum I see more and more people making great use of them. The club still has a small boxford shaper that looks in excellent condition - gets little use.
Nick
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version