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Sep 21, 2012, 05:55 PM
oldtribefan
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Super job JayJay76! I am following this thread.
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Sep 21, 2012, 06:40 PM
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JOHN SCALE BOAT's Avatar
Can not wait to see the plans! Looking for a winter project.
Sep 21, 2012, 08:49 PM
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Ed Crowell's Avatar
Quote:
Originally Posted by frankg
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
Sep 22, 2012, 12:26 AM
Taking care of the pond.
MILLERTIME's Avatar
Can't wait.
Sep 25, 2012, 08:54 AM
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JayJay76's Avatar
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.
Sep 25, 2012, 09:58 AM
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JayJay76's Avatar
Ready to start milling..
Sep 25, 2012, 02:47 PM
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JayJay76's Avatar

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 03:58 PM.
Sep 25, 2012, 02:57 PM
---o-O-o---
blutoh's Avatar
Jason,

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

Pete
Sep 25, 2012, 03:00 PM
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JayJay76's Avatar
Its an end mill I think.
Sep 25, 2012, 03:06 PM
---o-O-o---
blutoh's Avatar
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
Sep 25, 2012, 03:24 PM
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JayJay76's Avatar
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.
Sep 25, 2012, 03:30 PM
---o-O-o---
blutoh's Avatar
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
Sep 25, 2012, 04:07 PM
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JayJay76's Avatar
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.
Sep 25, 2012, 04:09 PM
Spreckels Lake, GGP, SF, CA
craig_c's Avatar
Ye be gatherin' fans
Latest blog entry: Ah, To be young again...
Sep 25, 2012, 04:45 PM
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JayJay76's Avatar
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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