iTopSpin

Current Posts => Collecting, Modding, Turning and Spin Science => Topic started by: lincolnrick on October 02, 2012, 08:06:19 PM

Title: Who made this big top?
Post by: lincolnrick on October 02, 2012, 08:06:19 PM
I've had this big top forever and just came across it in one of my top boxes.  I think Don Olney had something to do with its creation, but I could be completely wrong.

Anyway there are no markings on the top, and it's pictured alongside an old Monarch.  It's 6 inches tall and about 4 3/4 inches in diameter. The other pic is a closeup of the tip area.

Anyway, it's very different and is going back on my mantle as part of my 'Big Top' collection.

Help me identify it?

Title: Re: Who made this big top?
Post by: the Earl of Whirl on October 02, 2012, 08:38:40 PM
I have one but Mark Hayward has two.  But none of ours has a tip section like that!!!
Title: Re: Who made this big top?
Post by: johnm on October 02, 2012, 09:33:47 PM
Here is a pic of Mark with his
(http://www.markhayward.net/html/images/Combo_Blue.72smRGB.jpg)

Mike's apears in ta0's video tour of the hall of fame at 5:33

Mike Hout's Spinning Top Hall of Fame (http://www.youtube.com/watch?v=GohzdFzqoG0#)

Title: Re: Who made this big top?
Post by: Watts' Tops on October 03, 2012, 12:08:03 PM
That is a Don O. Top.  I goofed up by not buying one once.
Title: Re: Who made this big top?
Post by: ta0 on October 03, 2012, 01:08:44 PM
I'd trade a Giulia or $$ for one of those . . .
Title: Re: Who made this big top?
Post by: lincolnrick on October 03, 2012, 01:36:52 PM
So is the one I have a prototype?
Title: Re: Who made this big top?
Post by: johnm on December 26, 2012, 09:03:52 AM
just a bump because I saw Don was logged in.  Any story behind this top Don?
Title: Re: Who made this big top?
Post by: silvertop on December 26, 2012, 10:09:22 AM
I confess!  A friend had a small "educational" size rotational molding machine, and I managed to obtain it - even though I am a confirmed wooden toy guy!  I had a mold created for it by a talented machinist friend, and was ready to go.  At first I didn't have any tips, so that tip in the picture is the end cut off one of my wooden tops with the regular plastic tip I used at the time.  They were very hard to get balanced properly.  The plastic does not distribute around the inside of the mold very perfectly.  I still have a couple of these plastic tops around - including at least one with a nice turned metal tip.  I also still have the rotational molding machine, and as far as I know I have the top mold.  If any one is interested, let me know, and I'm sure we can work something out to pass it on to a better home quite reasonably.  I've been looking for a picture of it, but can't find it right now.
Title: Re: Who made this big top?
Post by: ta0 on December 26, 2012, 11:24:49 AM
I am interested!  Sending PM.
Title: Re: Who made this big top?
Post by: the Earl of Whirl on December 26, 2012, 02:16:40 PM
Oh boy!  This will be interesting!!!
Title: Re: Who made this big top?
Post by: Neff on December 26, 2012, 07:36:27 PM
GAH! Yes, I am interested also!
Title: Re: Who made this big top?
Post by: Kirk on December 29, 2012, 02:15:29 PM
Rotational molding is inherently bad at making uniform wall sections.  I have just recently completed the design of a project with several roto-molded parts. 
Quick descriptions;
Themo-set roto-molding: Used for smaller parts and prototypes.
Material such as 2 part urethane is mixed and placed in the mold. The mold spins slowly in every direction, coating the mold as the plastic cures.
Themo-plastic roto-molding: Used for large tanks
Plastic powder (usually Polyethelene) is added to a cold mold. The slowly spinning mold enters an oven.  The plastic is melted just enough to coat the mold, but not enough to make it a runny liquid.  Molds are very thin to allow heat to get from the oven to the powder. By adjusting the external mold geometry one can locally speed the heat transfer and thus add wall thickness. (for instance adding thickness/weight to the rim of a top)

Best wishes to what ever person or persons get the tools!
Title: Re: Who made this big top?
Post by: Dojo-yoyo7 on December 30, 2012, 04:06:56 PM
I've. Seen one of those I want one sooooo. Badly