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Old 03-21-2020, 08:01 AM
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Originally Posted by Glowgeek
Seems like from what I've read from the laser kit sites that they require builders to laminate sheets together to create thicker stock. Apparently you're not the only only one having problems with burnt wood and dimensional tolerance issues.
There are so many variables to cutting, it's hard to keep track of. I started a spreadsheet to keep track of speed and power settings for various woods. There is one more variable I haven't touched on, and that is air pressure. The nozzle has compressed air blowing through it to force smoke and gasses away from the material and to keep the lens clean. Too much air pressure can accelerate the burn, or cool the burn so that it doesn't fully cut. I haven't done any modifications to it yet since I have not felt a need to, but with more scenarios available, at some point I may regulate it, which adds another column to the spreadsheet.

As far as laminating goes, some builds use laminated balsa, Hermkins builds his like that, and I have the plans for his B-17. He uses 3 sheets laminated cross grain. Since Balsa cuts so easily, the only undesirable is thicker sheets with hard knots that tend to blow out, I can see why other cutters would have them laminate. On the Corsair the main spar is 1/2" thick, and is built up with 6 pieces of 1/8" plywood. 4 being birch, the middle layer lite ply. It is these pieces where I planned to use 6 ly, but found it too difficult to cut cleanly, so switched to 3 ply which does. To cut 1/4 and thicker ply, and the more plies in the sheet, the more power is required and leads to undesirable cuts, so make sense. I know I don't want to overdrive my tube. I have a mark on my meter that is my safe zone, while I can exceed it, I don't want to as it will shorten the life of the tube, no matter how cool I keep it.

A replacement tube and power supply( a higher watt tube than I have needs a new PS) runs anywhere from $500 to $800 depending on brand. I am considering a Reci tube because they have an 18 month warranty, which to me means that it is high quality. Lessor warranties don't mean lessor quality, but it also means the company doesn't stand behind their product. Also means, you get what you pay for.

Anyhow. back to your regularly scheduled Saito Forum. Has anyone put a radial on the .60 TF Corsair?
Old 03-21-2020, 08:13 AM
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How about this one:

Fast forward to 6:40


Last edited by Glowgeek; 03-21-2020 at 08:51 AM.
Old 03-21-2020, 09:22 AM
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Ah 120R3. Seems like that would be a perfect fit.
Old 03-21-2020, 10:12 AM
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Indeed




Last edited by Glowgeek; 03-21-2020 at 10:18 AM.
Old 03-21-2020, 11:28 AM
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Originally Posted by acdii
Thanks.

Metal cutting with a laser is easy, metal doesn't vary in density like wood, so when you put a board in and its cutting through and then hits a hard spot it can flash and burn more wood and not cut through
Understand that. We cut and etch just about everything, wood included.

2 axis , flat blanks are one thing. Multi axis cutting 3D parts in any material, even metal is another.

As with cutting hypoid gear sets with form cutters Or milling and grinding those cutters.

All can be called "easy" but some take pretty advanced skill sets.

Last edited by Jesse Open; 03-21-2020 at 11:34 AM.
Old 03-21-2020, 04:27 PM
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Default 90t

Well I finally finished the rebuild of my 90T. It cleaned up real nice. Compression is good but Iím hoping it will improve after running in.

Iím very pleased with the new ultrasonic cleaner I purchased. Does a great job at cleaning things up. Great alternative to the antifreeze/crockpot method. I wasnít able to take apart the vane pump so I just threw it in there for a cycle and came out loose and shiny.





Any guesses as to my next project???
Old 03-21-2020, 05:02 PM
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Nice looking 90T, good work. Your next project looks like a ST 60cc inline twin!
Old 03-21-2020, 05:04 PM
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Originally Posted by Glowgeek
How about this one:

Fast forward to 6:40

https://youtu.be/gH0N1HoEeX4

oops , those are the same retracts I have on my VQ P-40 ,
but the thing is they come with a voltage regulator on the Y-harness, maybe he didn't use it and he burned out the electronics on one motor ??

Jim

Last edited by the Wasp; 03-21-2020 at 05:09 PM.
Old 03-21-2020, 05:15 PM
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Originally Posted by Glowgeek
Nice looking 90T, good work. Your next project looks like a ST 60cc inline twin!
Thanks Glowgeek.

Yes sir! Super Tigre 60cc twin. Currently stuck.
Old 03-22-2020, 03:17 AM
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Very nice job on the 90T!
Old 03-22-2020, 07:03 AM
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Pete would love the green prop nut spacer.
Old 03-22-2020, 08:18 AM
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Originally Posted by Hobbsy
Pete would love the green prop nut spacer.
It is pretty sexy!
Old 03-22-2020, 10:44 AM
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Haha! Itís just some leftover poly tubing I cut to keep the washer from flopping around.
Old 03-22-2020, 11:19 AM
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Some bad news on the Tiger. The #2 piston pin is broken. Hope I can find one.

What a beast of an engine! Over 6 lbs total wt. The center section has 2 massive bearings & center crankshaft.

Old 03-22-2020, 11:23 AM
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Start a thread and invite us!
Old 03-22-2020, 11:53 AM
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Originally Posted by Glowgeek
Start a thread and invite us!
yeah what he said

Ken
Old 03-22-2020, 03:50 PM
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Originally Posted by Glowgeek
Start a thread and invite us!
Originally Posted by flyingagin
yeah what he said

Ken
I totally agree!

Mike
Old 03-22-2020, 04:41 PM
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Originally Posted by Glowgeek
Start a thread and invite us!
Originally Posted by flyingagin
yeah what he said

Ken
Originally Posted by FlyerInOKC
I totally agree!

Mike
OK. There seems to be interest in this so a thread will be started. Iíll post a link once itís up.
Old 03-22-2020, 04:46 PM
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Gary, PM received
Old 03-22-2020, 05:22 PM
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Well I guess itís ready
46 size World Models with a 125GK. Should move right along.


Old 03-22-2020, 05:27 PM
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Looking good Crunchy! What prop are you running for maiden?
Old 03-22-2020, 05:38 PM
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boy that thing is going to zip along pretty good

Jim
Old 03-22-2020, 06:07 PM
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I was going to try a 15-10 APC and see
if that doesnít work I will drop too a 14-10 APC.
Old 03-22-2020, 10:21 PM
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this model is just crazy big

Jim

Old 03-23-2020, 03:58 AM
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Originally Posted by Captcrunch44
I was going to try a 15-10 APC and see
if that doesnít work I will drop too a 14-10 APC.
14x10 apc sounds good, the 15x10 will load the engine down quite a bit.

It's a 46 size size warbird with a big engine and prop so excessive torque and P-Factor can cause issues on take off.
Set up rates for full rudder travel w/ 70% expo, advance throttle smoothly on roll out, wait for good ground speed before rotation and takeoff will go off without a hitch.

Failure to comply will result in a torque roll 6 ft off the ground and your Strega will be re-kitted for you right quick.....oh wait, that was my Strega.


Last edited by Glowgeek; 03-23-2020 at 04:14 AM.

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