[TANKS] Re: turret molding question

2009-01-09 Thread Paul Hilton
Doug, I used Styrofoam covered in aluminum foil for the BT-7 turret. I still have the form. It was constructed from layers of Styrofoam. Hard templates were used for guiding a bread knife to cut the conical shape. I used a positive mold method. The form was made a bit smaller than the finis

[TANKS] Re: turret molding question

2009-01-09 Thread Chris. b
Make your master exactly how you want your turret to look, then give it a couple of coats of fibreglass. Pull the master out and discard it. Once the master is out you have a perfect negative replica of your turret, coat the inside of the fibreglass shell with a mold release, then layup more fibre

[TANKS] Re: turret molding question

2009-01-09 Thread Doug Conn
Oh ! I see now. Ron, is this what you were describing, too ? Sorry, I misunderstood. I guess it would be like this, then, where I sand away the blue areas What material is a good choice ? I don't think foam would work for vacuforming. Even I use fiberglass, I'd like a mold that survives

[TANKS] Re: turret molding question

2009-01-09 Thread Ron
Frank, That is what I was attempting to say. You did it so much better! Ron Frank Pittelli wrote: > Doug Conn wrote: > >> I created patterns for the MDF layers by taking horizontal slices of the >> tank turret from a 3d model. I was hoping that by having those slices the >> right shape, ther

[TANKS] Re: turret molding question

2009-01-09 Thread Frank Pittelli
Doug Conn wrote: > I created patterns for the MDF layers by taking horizontal slices of the > tank turret from a 3d model. I was hoping that by having those slices the > right shape, there would be a lot less I'd need to eyeball when sanding. You can use the "bread and butter" approach: 1) Creat

[TANKS] Re: turret molding question

2009-01-09 Thread Chris. b
I'm looking at building a very similar turret for my T55, I'm going to be using foam and plaster filler. Easy to shape, cheap to buy. Maybe cut your layers in foam, then simply fill in the rest with filler I'm going to be fibreglassing mine simply because I have more experience with it then I do

[TANKS] Re: turret molding question

2009-01-09 Thread Ron
That's the beauty of the lift method. Each slice defines the widest point of that slice. When you do the final shaping, you carve down to the next slice, first with a plane or chisel, then with a soft pad sander to fair things up. You would have to use something more workable than MDO though.

[TANKS] Re: turret molding question

2009-01-09 Thread Doug Conn
The turret is an odd, irregular shape. I don't think I have the skills or 'artists eye' to get it even close to right. I created patterns for the MDF layers by taking horizontal slices of the tank turret from a 3d model. I was hoping that by having those slices the right shape, there would be a l

[TANKS] Re: turret molding question

2009-01-09 Thread Ron
While I have never built a tank or a mold, I have built a number of boats both scale and up to 20 feet full size. Rather than filling and sanding, how about making the mold oversize and then sawing/planing/surforming/sanding to size. It should be less work and less expensive. Ron Doug Conn w

[TANKS] Re: Small progress.

2009-01-09 Thread Aahz
odysseyslipw...@aol.com wrote: > In a message dated 1/9/2009 3:49:49 A.M. Eastern Standard Time, > aah...@gmail.com writes: > > I estimate it will weigh in at around 200lbs and at stall the > motors > pull nearly 4500 watts. > > Aahz. > > and you are powering this tank with one

[TANKS] Re: Small progress.

2009-01-09 Thread OdysseySlipways
In a message dated 1/9/2009 3:49:49 A.M. Eastern Standard Time, aah...@gmail.com writes: I estimate it will weigh in at around 200lbs and at stall the motors pull nearly 4500 watts. Aahz. and you are powering this tank with one of Tony Stark's Ark reactors? Chris, _Odyssey Slipway

[TANKS] Re: M01's - battery current

2009-01-09 Thread Derek Engelhaupt
Yeah, I was just trying to get a rise out of you Steve. God knows the Cromwell doesn't need anymore speed. :-) Derek On Fri, Jan 9, 2009 at 5:33 AM, Steve Tyng wrote: > >> I do believe the EV Warriors self destruct at 36V;-) > > The Battlebot guys used to run the EVW's at 36v for spinner

[TANKS] Re: turret molding question

2009-01-09 Thread AES
You may want to take a look at this then:   http://www.rachelsrobin.com/shop/index.php?page=shop-flypage-8150#   or this:   http://www.easypetstore.com/Squirrel-Guard-For-Bird-Feeders-Green-15-Inch-pr-236713.html         From: Doug Conn To: rctankcombat@googlegroups.comSent: Friday, January 9, 2

[TANKS] Re: turret molding question

2009-01-09 Thread Doug Conn
My example picture just shows a dome. The actual turret is kind of a squashed teardrop shape. It’s about 15” on the major axis, 13” on the minor axis, and about 5” tall. - Doug From: rctankcombat@googlegroups.com [mailto:rctankcom...@googlegroups.com] On Behalf Of AES Sent: Friday,

[TANKS] Re: turret molding question

2009-01-09 Thread AES
What is the height and diameter of the dome your making?  It looks similar to what we use for R2D2 droids.  The R2D2 domes are available as vacume formed Styrene.  Also in Aluminum.   Andy From: Doug Conn To: rctankcombat@googlegroups.comSent: Thursday, January 8, 2009 11:50:22 PMSubject: [TANKS

[TANKS] turret molding question

2009-01-09 Thread Doug Conn
Hello – A couple of weeks ago I mentioned my plan to build a turret mold. I haven’t decided yet if I’ll use fiberglass or vacuform. I thought I’d build the mold and then drill vent holes (and hollow it out a little) if I decided to use vacuforming. I want to use layers of ½” or 3/8” MDF to

[TANKS] turret molding question

2009-01-09 Thread Doug Conn
Hello – A couple of weeks ago I mentioned my plan to build a turret mold. I haven’t decided yet if I’ll use fiberglass or vacuform. I thought I’d build the mold and then drill vent holes (and hollow it out a little) if I decided to use vacuforming. I want to use layers of ½” or 3/8” MDF to

[TANKS] Re: M01's - battery current

2009-01-09 Thread Mike Mangus
Those 36v 20ah batteries would work very nicely in the Merkava and save around 20 - 30 pounds of weight. I'll be watching the prices and see how things look this coming spring. Mike M From: Steve Tyng To: R/C Tank Combat Sent: Friday, January 9, 2009 8:33:

[TANKS] Re: M01's - battery current

2009-01-09 Thread George Mastoras
Oops forgot to put the link http://www.evpower.com.au/-Lithium-Ion-LiFePO4-Batteries-.html On 9/1/09 10:55 PM, "George Mastoras" wrote: > > Heres another site on batteries, I kinda like the ready made batteries > looking like SLAs, very suitable for tanks. The 12AH batteries might be an > op

[TANKS] Re: M01's - battery current

2009-01-09 Thread George Mastoras
Heres another site on batteries, I kinda like the ready made batteries looking like SLAs, very suitable for tanks. The 12AH batteries might be an option to build with. Could start with 2 maybe, at that size you could use the batteries for other applications increasing their return value. On anoth

[TANKS] Re: M01's - battery current

2009-01-09 Thread Modena
I got a local quote from the AU distributor, $1400 for 24v 20ah + about another $200 for charger - no doubt these genuine ones are all singing all dancing and tested to hell and came back prancing. I think I'll get a Chinese knock off from ebay On Jan 9, 10:33 pm, Steve Tyng wrote: > > I do be

[TANKS] Re: M01's - battery current

2009-01-09 Thread Steve Tyng
> I do believe the EV Warriors self destruct at 36V;-) The Battlebot guys used to run the EVW's at 36v for spinner weapons. Anyway, I wouldn't seriously try to run my tank at 36v. It's been proven very reliable at 24v and why mess with a good thing. The 36v 20ah pack could be fabricated to p

[TANKS] Re: Small progress.

2009-01-09 Thread Aahz
Crooks, Steven M wrote: > The T-35 is a truly inspiring project. > > This tank is going to be very interesting. > Hiow much do you think it will weigh, and whats the wattage of the motors? > I estimate it will weigh in at around 200lbs and at stall the motors pull nearly 4500 watts. Aahz.

[TANKS] Re: Small progress.

2009-01-09 Thread Aahz
Paul Hilton wrote: > I don't mean to steal Aahz's thunder, but maybe I can help clarify. > Quite a while ago, Aahz stated that only the main turret will fire. > The others will be cosmetic. I suppose this means that when the > main gun is aimed in any given direction, the other four will try

[TANKS] Re: M01's - battery current

2009-01-09 Thread Paul Hilton
Yep, real deal with all the high end add ons. I'm not sure what Globe TRAC is, but I'm pretty sure that we could do without it, the requisite Bluetooth box and service fees. As to the cheap Chinese knock-offs, I would remind everyone that the vast majority of goods sold in the western world a