LumberJocks

Jarrah Top

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Project by Jim Jakosh posted 11-15-2021 03:45 AM 828 views 2 times favorited 31 comments Add to Favorites Watch

This is a top I made to see if I could make one to run 6 minutes. It is made from Jarrah wood and had a brass insert in the bottom and a hardened 3/16” steel ball pressed into it for the point to ride on. It is 4 3/8” diameter and 3 1/2” high and weighs 17.9 ounces with a 3/8’ x 1/2” dovetailed shape band of lead in the perimeter.

The wood was turned with a spigot/tenon on both ends. Then it was parted into 2 pieces. The bottom half was grooved and filled with molten lead and faced flat. The top was faced flat and glued on and it was bored for the handle and the brass pivot on the bottom. It is finished with Danish oil and has yet to be buffed and waxed.
I made a video of it running: https://www.youtube.com/watch?v=4UjvN-jABCI

It originally ran 9 min 22 sec when it started spinning at 2500 rpm but in the video the speed started at 2077 and it only ran a little over 7 minutes. I have had other 8 and 9 second runs but I must have been tired tonight and did not pull fast enough

Cheers, Jim

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!





31 comments so far

View lew's profile

lew

13488 posts in 5089 days


#1 posted 11-15-2021 04:04 AM

Neat idea on the tip. How did you measure the RPM’s?

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

View therealSteveN's profile

therealSteveN

9383 posts in 1907 days


#2 posted 11-15-2021 04:32 AM

Cool looking top Jim. Tried the video, takes me to a Goofle sign in sheet, is that right? Was just at You Tube and didn’t see that with other videos?

-- Think safe, be safe

View crowie's profile

crowie

5254 posts in 3284 days


#3 posted 11-15-2021 04:45 AM

Jarrah is a gorgeous red Aussie hardwood Jim, originally a West Australian timber. I suspect pretty difficult to source in the USA, beautiful top.

-- Lifes good, Enjoy each new day...... Cheers from "On Top DownUnder" Crowie

View Dave Polaschek's profile

Dave Polaschek

9319 posts in 1916 days


#4 posted 11-15-2021 05:14 AM

Neat. I figured loading with lead would increase the spin time. I also need to figure out a launcher at some point. I’m currently just spinning them between thumb and finger…

-- Dave - Santa Fe

View BobWemm's profile

BobWemm

3071 posts in 3259 days


#5 posted 11-15-2021 06:52 AM

Great job Jim, you certainly went into this one.

Thanks for sharing

Bob

-- Bob, Western Australia, The Sun came up this morning, what a great start to the day. Now it's up to me to make it even better. I've cut this piece of wood 4 times and it's still too damn short.

View therealSteveN's profile

therealSteveN

9383 posts in 1907 days


#6 posted 11-15-2021 06:53 AM

That’s awesome Jim. Thanks for fixing the link. I love tops.

-- Think safe, be safe

View BB1's profile

BB1

2813 posts in 2181 days


#7 posted 11-15-2021 12:17 PM

Great looking top and the video proves it works great as well! Wow – that is a long time. Wondering if that is an official top testing board setup. ;) Maybe the time would have been longer if it didn’t bump the side in the beginning….

View Jim Jakosh's profile

Jim Jakosh

27241 posts in 4439 days


#8 posted 11-15-2021 01:57 PM

Thanks for all the nice comments.

Hi Lew. I check the RPM with a little hand held laser tachometer. the top has a small reflective piece stuck on it that the tach. reads.

Hi Dave, even without the lead, they run for a long time if you keep the mass to the very outer perimeter by thinning out the center…...like a gyroscope. I’ll put some shot of the launcher below.

Thanks Barbara. I think they spin out like that when I launch them a bit out of perpendicular to the table. The 9 minute run hit the side too but it was really flying .

Cheers, Jim

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

View HokieKen's profile

HokieKen

20652 posts in 2472 days


#9 posted 11-15-2021 02:17 PM

You and Dave P have me looking forward to turning some Christmas gift tops :-)

-- I collect hobbies. There is no sense in limiting yourself (Don W) - - - - - - - - Kenny in SW VA

View doubleDD's profile

doubleDD

10915 posts in 3376 days


#10 posted 11-15-2021 02:37 PM

Jim this is fascinating. I’ll admit that I can go crazy by the time it runs out but this is something I’m gonna make soon.
Most of the fun will be making it and the challenge of the spinning time. My hand surgery is going to keep me out of the shop for quite awhile so I’ll favorite it so I don’t forget. The launcher is cool too, better than anything I’ve ever seen. I have a couple blocks of Lignum vitae so now I know what they will be used for.

-- Dave, Downers Grove, Il. -------- When you run out of ideas, start building your dreams.

View Jim Jakosh's profile

Jim Jakosh

27241 posts in 4439 days


#11 posted 11-15-2021 02:46 PM

Hi Ken..we are having fun and like to share it on here for other interested Lumberjocks.
Glad we could excite you!!!!!!!!!!!!!!! Kids still love them….even us big kids.

Dave, the sky is the limit on design. I have been thinking of using my index wheel to put some cool patterns in some of the tops…but time is getting short and I have to wrap things up here . It is getting cold in the barn this time of year and I bought a propane heater that fits on a 20# tank and I use it for local heating for quick jobs so I don’t freeze. The tank is on wheels so it goes everywhere easily. Some times I melt wax and sometimes lead!

Cheers, Jim

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

View Underdog's profile

Underdog

1802 posts in 3369 days


#12 posted 11-15-2021 03:09 PM

That’s pretty cool! I thought some of mine ran a while, but 9 minutes would be a record!
I’m astounded at the world records you mentioned! 27 minutes! Wow!

Thanks for the tip on the Kevlar fishing line. Best I’ve found locally is that braided masonry contractor’s string. But the ends tend to unravel after a while and that makes it hard to get it into the holes.

-- Jim, Georgia, USA

View Ivan's profile

Ivan

17135 posts in 4201 days


#13 posted 11-15-2021 03:46 PM

Interesting wood, beautiful colour!

-- Ivan, Croatia, Wooddicted

View Jim Sellers's profile

Jim Sellers

519 posts in 3668 days


#14 posted 11-15-2021 04:42 PM

very nice toy Jim. I love tops and am planning on turning one or two soon. (I like the ones you throw with a string) Didn’t realize it was that big until I watched your video. Here’s a video of one I invented a while back I posted here that I thought was genius but it didn’t get much attention https://www.youtube.com/watch?v=JclY0Ho9dC8

-- J.C.Sellers, Norcross, Ga. Just cut it right the first time. The best carpenters make the fewest chips.

View Dave Polaschek's profile

Dave Polaschek

9319 posts in 1916 days


#15 posted 11-15-2021 06:18 PM

Thanks for the shot of the launcher, Jim. That’s about what I figured. Just have to get a round tuit. ;-)

-- Dave - Santa Fe

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