Lumenier RB2205C-12 2400KV SKITZO Ceramic Bearing Motor
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Old Sep 21, 2012, 06:55 PM
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Super job JayJay76! I am following this thread.
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Old Sep 21, 2012, 07:40 PM
JOHN SCALE BOAT is offline
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Can not wait to see the plans! Looking for a winter project.
Old Sep 21, 2012, 09:49 PM
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Quote:
Originally Posted by frankg View Post
HEY ED!!! Did you ever finish your speedster? If you did have you had your shake down cruise? It has been awhile since you posted on your speedster thread.
frankg,

I set the Gar Wood aside for a while. I expect to start working on the boat in a couple of weeks. It will be completed.

Ed
Old Sep 22, 2012, 01:26 AM
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Taking care of the pond.
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Can't wait.
Old Sep 25, 2012, 09:54 AM
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I plan to mill the parts out of the plywood sheet with a 3mm cutter, so I made 1,5mm offsets around each part to serve as the tool paths, but I had to make some tweaks to the slot width since my material is actually 3,2mm thick. This doesn't sound like a big problem but anywhere the material is doubled, such as the keel, the 0,4mm difference would make the parts too tight to fit together. I hadn't realized this before but the part design relies heavily on the material thickness.

I laid out all the parts carefully to make best use of material and ended up with three CNC files. Getting ready to mill the first of three sheets of parts.. I will take photos and post them later tonight or tomorrow morning.
Old Sep 25, 2012, 10:58 AM
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Ready to start milling..
Old Sep 25, 2012, 03:47 PM
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The first sheet of parts has been cut!


That went much smoother than I expected, my layout seemed almost perfect except for a few small glitches, but I will fix those in the next two sheets before milling. Total milling time was a little less than 90 minutes, but I think the 4 step cutting is unnecessary, so the next sheet should cut 25% faster, and the 140% cutting speed worked out well. Here are some pics of the milling for those interested in such things
Last edited by JayJay76; May 10, 2014 at 04:58 PM.
Old Sep 25, 2012, 03:57 PM
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Jason,

Are you using and End Mill, or a spiral flute to do the cutting?

Pete
Old Sep 25, 2012, 04:00 PM
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Its an end mill I think.
Old Sep 25, 2012, 04:06 PM
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If you have a spiral flute available, try it. It may allow you you to take deeper, and possibly cleaner, cuts as it's designed to cut on the sides of the bit. I use them in my router table to do template cutting. Might be worth a try.

Pete
Old Sep 25, 2012, 04:24 PM
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I'll ask if we have one, but they normally only mill 3D mockups, no 2D milling. I dunno if spiral flutes are used for that.
Old Sep 25, 2012, 04:30 PM
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No, 3D is usualy done with ball mills and end mills. If you plan to cut a lot of these, it may be worth the investment in the spiral flute. Here a decent carbide spiral flute sells for around $50 US. Not sure what it would cost on your side of the pond. BTW, that's a sweet CNC router mill. is this a commercial service you are using?

Pete
Old Sep 25, 2012, 05:07 PM
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No that's the model shop in my office, I'm not experienced in operating the cnc machine myself, but the modelmakers are friends of mine so they don't mind running private jobs for me when it's not in use. I also have access to the other mills, lathe, spray booth, etc.
Old Sep 25, 2012, 05:09 PM
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Ye be gatherin' fans
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Latest blog entry: Ah, To be young again...
Old Sep 25, 2012, 05:45 PM
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I ordered the book "mahogany in scale" from Amazon a couple days ago, I had hoped to receive it today and stay up all night studying. I'm so excited to see what's in it before I continue planning the planking layout. What's a reasonable plank width for the sides and bottom of a boat like this? Ill be using 2mm thickness. And what to use for the black caulking lines?


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