3573 replies to this topic

[Victor Poulin]

Looks good Robert. Are you going to tie and epoxy the tabs?

[Robert V.]

Thanks Vic , yes i still have to tie up the tabs using kevlar thread than a coat of heat resitant epoxy recut the comm and do a static balance which will be last on the list, i will post a pics after each stage. Another tip as you can see from my pics the work on this arm was a bit untidy because i went to fast trying to finish the post take your time and be as neat as possible the neater you are the better the balance of the arm and less of a chance of throwing a winding and it just looks better to.

[havlicek]

Really nice work Robert , and an excellent step-by-step too I'll be watching until you finish, as I really enjoy seeing other people's winds! Thanks for sharing!

-john

[havlicek]

I spent the day recuperating from last night's gig, just flopping around in sweat pans, a T-shirt and slippers. It also seemed like a good day to get back onto a project I started a looooong time ago. I had a pretty beat-up Mura B-motor and a really strong set of B-motor magnets to go with it and had cleaned it up and sprayed it textured black. With the motor being a relatively heavy/solid thing, I built a set of heavy buss bars to go with the stock end bell hardware, and radiused-out the inside a little to clear the com. Having learned some new tricks lately for winding, I applied that to an arm I made-up out of loose Mura .007" lams, as well as a salvaged Mura com and a new drill blank shaft. The wind is a #24 awg, and after not having done big wire arms again until recently (which are tough on the thick web of the Mura lams), things did go a little more easily. Small steps...wax on...wax off.




-john

[Kim Lander]

John,
That wind looks like a hand full....let me know what it turns , love the can to.....Kim

[havlicek]

Will do Kim

-john

[Robert V.]

Thanks John, awsome work on that motor those bus bars look better than factory made, the stacks look like you took a lot of material off will you have to shim the magnets to close the air gap, 24 gauge it's going to scream.

[havlicek]

Thanks John, awsome work on that motor those bus bars look better than factory made, the stacks look like you took a lot of material off will you have to shim the magnets to close the air gap, 24 gauge it's going to scream.

Great work on yours too Robert. Thanks on the motor too. I usually don't make the buss bars so "stout", but it seemed appropriate for the B motor; it also made bending and fitting them a little more difficult than normal. I took very little off the stack, as the .007" lams polish out quickly. It's still just under .510" diameter and is a tight fit in the very thick Mura B magnets. The B motors had a reputation for getting too hot in any case, maybe partly because of the tight airgap...and maybe partly because all that metal held more heat than it radiated (others more in the know can fill in this info better than me). There have been some beautiful B motor builds here by Rick and Jairus that had originally inspired me and the project sort of got sidelined. I "rediscovered" the motor and figured it was time to get going on it again.

Enough of all this though, I'm looking forward to seeing yours "all dressed up for the party"!

-john

[One_Track_Mind]

Hi John,
GREAT looking B-Can motor!

I have more If you want to do some more of them.

[Jairus]

Beautiful work John. I love B motors!

When the B was first introduced it had two tiny holes on each side with the thoughts that a totally enclosed can increased the magnetic field. The early motors indeed got hot but what you have there is the last production motor can with the big hole needed for better airflow and improved cooling.

[havlicek]

Thanks Brian and Jairus, the info is much appreciated.


Kim,

The motor ran like a demon...and then lost a com plate! Fortunately, the blown com only took out the motor brushes, but I guess that's what I get using recycled parts on such a crazy motor. I'm going to redo this thing again and use a new com, because it was a wonderful sounding motor...while it lasted!

-john

[Robert V.]

Too bad the comm blew; that is a cool motor. Ot may not have been your recycled comm as I have had a comm come apart on a pretty new Parma S16D. Still have that motor, time to rewind again.

Time for an update, I tied the arm up using red Kevlar thread and gave it a coat of epoxy and heat-cured it then I painted the stacks with clear engine enamel.

I still need to cut the comm and do a static balance.

[havlicek]

To bad the comm blew that is a cool motor, it may not have been your recycled comm as i have had a comm come apart on a pretty new Parma S16d still have that motor, time to rewind again

Nah... I've learned to become a little more philosophical about these things and sometimes a blown arm will tell you more information than one that lasts. In this case, the "post-mortem" revealed that, despite a pretty lengthy run at a full 12Vv/no load, everything but the comm was in perfect shape. In any case, a #24 is right at or near the upper limit so getting one to hold up the way it should seems like a worthy quest! I have plans for winding a second that don't include used parts.



Your arm looks great Robert, and I betcha it's gonna be a real runner, too! Nice work.



-john

[Victor Poulin]

Lookin' better every time I see it, Robert!!

[havlicek]

... One mo' time, or... "hope springs eternal".:



-john

[Robert V.]

That arm looks awesome John such neat work on that heavy 24 gauge wire can't be very easy, I bet that's a new comm this time.

Thanks, Vic and John. The pic below shows my high tech balance tool. I think it's made by Tradeship. I am not sure how much a static balance helps but I can tell you the motor ran a bit smoother after the balance so I guess it worked.

John is correct; this motor really goes and it does not run hot it should hold together as I ran it at 15 volts for about 10 seconds. If that didn't blow it I think it's a good one. One more post to follow and it's finished.

[havlicek]

Houston... we have liftoff The arm absolutely screams. I made this arm up using one of Bill Bugeni's' comms and stacks and replaced the shaft with a longer drill blank, figuring the motor might get a comm cooler. With a used pair of brushes and regular Camen springs (no shunts yet), the motor screams like a banshee, and stops dead in its tracks when the power is removed.

This arm deserves the full treatment, so I'm going to send it out to be dynamically balanced, but Bill's arms and comms are way more in line for what a motor like this needs.

BTW, these arms are made using .014" lams, and the motor sure isn't complaining... wonderful!

-john

[Prof. Fate]

Hi

John, remember: "They are all DOOMED"....

Grin.

I did all the way down to a 22 back in the late 60s, but nothing hotter than a 26 was a race winner for me given my limited driving talent.

Fate

[Victor Poulin]

That arm looks awesome John such neat work on that heavy 24 gauge wire can't be very easy, I bet that's a new comm this time.

Thanks, Vic and John. The pic below shows my high tech balance tool. I think it's made by Tradeship. I am not sure how much a static balance helps but I can tell you the motor ran a bit smoother after the balance so I guess it worked.

John is correct; this motor really goes and it does not run hot it should hold together as I ran it at 15 volts for about 10 seconds. If that didn't blow it I think it's a good one. One more post to follow and it's finished.

Robert, I remember these balancers very well. Every now and then you still see them on epay for sale.

[havlicek]

Hi

John, remember: "They are all DOOMED"....

I never forget it Rocky, just trying to lengthen their lifespan. I've got one pretty crazy test arm in a motor that has 800 laps on it (using Bill Bugenis' parts)...and it's still ticking apparently.

I did all the way down to a 22 back in the late 60s, but nothing hotter than a 26 was a race winner for me given my limited driving talent.

Things have definitely changed in that regard Rocky. People are racing motors now I wouldn't have dreamed were possible.

-john

[don.siegel]

Did you guys notice that this thread is on page No. 100?

CONGRATULATIONS JOHN!

And thank you for one of the best and most inspiring threads ever to appear on a slot car forum.

Don

[havlicek]

Hi Don...and many thanks It's because of "enablers" like yourself, that it's got this far though, so credit goes to SlotBlog...not me! I just thought of something, I hope Philippe doesn't send me a bill for "extra bandwidth surcharges"

-john

[Robert V.]

Yep Vic that's where i got it about 3 years ago for i think $20.00 i tnink i payed to much but at least i am starting to use it, I agree with Don this thread is doing great lets keep it going.

[Champion 507]

John, I don't know if PdL can charge you for extra bandwidth. After all, he doesn't really know how wide your band is to begin with. Besides, he'll just probably want some free motors or motorwork instead.

[Alchemist]

I would like to offer my congratulations also John!!

By the way, the HAWK came in the mail today - Thank you so much for your time John!!! I'm excited to have it along with my other motors you did "makeovers" on.

Ernie