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Post by Mark Huber on Mar 30, 2014 9:17:14 GMT -5
I thought I'd try a Beardog Mk 3 chassis for this car. I needed to extend the wheelbase about 2.5mm which I did the other day. I cut out the spring steel side rails and replaced them with 1/16" piano wire. The chassis seems quite sturdy, but I believe there is still some flex. Whether it will improve race performance remains to be seen. I'm not thrilled with the position of the driver. I don't think I can get the figure any lower as the sides of the body are so shallow. The flex bar that runs down the center of the chassis pan prevents me from offsetting the gear 1mm below the axle center. Right now that's a bit of a moot point as the motor plate opening is too small to allow either an FFO50 or FF030 motor to fit flush. I'll have to do some work with a diamond tipped Dremel bit to enlarge the opening. I spoke with Chris about this; he will be contacting Andy, so I am sure the issue will be corrected in future production runs.
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Post by Andrew Rowland on Mar 31, 2014 7:50:58 GMT -5
Nice work there Mark. Fitting driver figures is often a pain especially in such low and thin cars. We really need to find some viable motor solutions that are far smaller than we currently use for these type of cars....
Andi
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Post by Mark Huber on Apr 6, 2014 15:02:00 GMT -5
Had I used a 2 mm brass tube for the center pivot, I would been able to offset an FF050 or FF030 motor, but I didn't discover my error until after I'd soldered the 3/16" tube in place--and I didn't have any of the 2 mm tube at the time in any case. So I decided to try out a smaller Mashima motor. As the car is no longer proxy series legal, I thought I'd try wider wheels and tires.. the Monogram replica rears are a touch too wide, but the next size down a bit too narrow. In any case, the Ferrari is evolving--definitely a work in progress.
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Post by Mark Huber on Apr 12, 2014 18:47:59 GMT -5
This little Mashima motor caused me no end of grief over the past 24 hours. The power was erratic and then non-existent. After determining that it wasn't a problem with the lead wires or pickup, I did what I always do in these situations-- I called Chris. Chris suspected it was a cracked brush. It was. Minor surgery was required. The process reminded of those days in my youth when I'd fiddle with minute brushes in the Aurora Thunderjet motors. Except the Mashima brushes are a lot trickier to replace. The recommended technique requires at least three hands. But I persevered, and the motor is now humming nicely. I didn't take pictures of the process, it was hard enough to do the fix with just two hands.
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Post by slo on Apr 12, 2014 20:51:45 GMT -5
looking good Mark! The Mashima motor really looks the part in this chassis,IMO. What rpm do these Mashima motors pull and who sells them?
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Post by Mark Huber on Apr 13, 2014 10:33:22 GMT -5
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Post by slo on Apr 14, 2014 8:40:00 GMT -5
Thanks Mark, I know nothing about armatures. Do wizard do a custom armature for this Mashima and is it this that ups the rpm? There seems to be a lot of different Mashima motors available which makes it a bit confusing. Dont mean to be directing this thread away from the topic but is your motor a FM1024 (rated at 14.1 rpm) with a wizard armature, or, is it the FM1024F rated at 20.5 rpm?
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Post by Chris Wright on Apr 14, 2014 11:48:02 GMT -5
Thanks Mark, I know nothing about armatures. Do wizard do a custom armature for this Mashima and is it this that ups the rpm? There seems to be a lot of different Mashima motors available which makes it a bit confusing. Dont mean to be directing this thread away from the topic but is your motor a FM1024 (rated at 14.1 rpm) with a wizard armature, or, is it the FM1024F rated at 20.5 rpm? Hi Slo, the motor Mark has is a Mashima M920 rated at 14.0 RPM, he replaced the armature with a hot stock Wizzard unit, and now estimates free running revs to be at 21K. The FM1024 is a can motor with weak magnets rated at 14.1, it is larger, and has no brakes. Above is a M-920 from Roundbell or the M-20KDA from PojezdyThey come with a 5 pole train armature that is heavy on torque but low on revs. I have updated the links on Marks previous post, and I believe Roundbell is out of stock at the moment, but Pojezdy has them at a considerably lower price. Any armature from an H.O. motor with 3-o-clock and 9-o-clock timing will work, but the ones for the wizzard cars work best you can go from a hot-stock to a custom re-wound. I use a hot stock armature, the main reason to use these motors is size, they are very small, but give about the performance of a mild 050 can, and they can be repaired. Plus they use stock off the shelf parts. Mark I hope you don't mind me answering this for you,...Chris
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Post by slo on Apr 14, 2014 15:33:45 GMT -5
Thanks Chris! I know modifying motors prohibits cars from proxies, mostly, but I think open motors can adorn a chassis like a jewel. The idea of being able to tune a motor has always been foreign to me, it is another interesting element to scratch building.
What are your thoughts on this ones performance Mark. How does it go ?
cheers
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Post by Mark Huber on Apr 14, 2014 16:49:05 GMT -5
Thanks Chris! I know modifying motors prohibits cars from proxies, mostly, but I think open motors can adorn a chassis like a jewel. The idea of being able to tune a motor has always been foreign to me, it is another interesting element to scratch building. What are your thoughts on this ones performance Mark. How does it go ? cheers Chris' description is accurate, my motor has the performance of a mid range FF050 in a package that is much smaller than an FF030 motor. The Mashima has magnetic down force that might be noticeable with a wire and brass scratch built chassis. However the traction magnetic effect is neutralized by the spring steel Beardog chassis. The Mashima is a great motor for the 1.5L vintage F1 cars with narrow and/or low engine compartments such as: Lotus 25 or Lotus 33 BRM P578 BRM P261 Brabham BT 7 or BT 11 I've built all of these cars with either an FF030 Solarbotics or an FF050 motor, and the Mashima would fit much better in all of them. NOTE: Neither Chris nor I are paid representatives of the Mashima Company.
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Post by Mark Huber on Apr 29, 2014 10:05:09 GMT -5
I ordered 3 Mashima motors and a few spare parts from the Czech Republic which arrived in 10 days. I'm still waiting for the replacement armatures, (which have to come to Montana all the way from Pennsylvania). There's no rhyme or reason to shipping/mailing times in this country!
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Post by David Mitcham on Apr 29, 2014 11:50:07 GMT -5
Hi Mark, Chris,
Which hot stock Wizzard armature fro Lucky Bob's do you use, please? There are several on the list and it's not clear which are suitable for the Mashima. I bought a Mashima last year off e-bay and haven't used it yet.
Best Regards
David
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Post by Chris Wright on Apr 29, 2014 12:11:45 GMT -5
Hi Mark, Chris, Which hot stock Wizzard armature fro Lucky Bob's do you use, please? There are several on the list and it's not clear which are suitable for the Mashima. I bought a Mashima last year off e-bay and haven't used it yet. Best Regards David I use these: HOT STOCK PATRIOT ARMATURE EPOXIED/BALANCED/COMM TRUED APROX. 6 OHMS or any of the armatures listed as a T1/PANTHER/T+/STORM PATRIOT armature. BUT NOT THE SUPER G+, G3 & G3R ARMATURESI find the hot stock armatures to be fine, but if you want to go wild, buy a custom rewound, as they say: speed costs money, how fast do you want to go? Chris
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Post by David Mitcham on Apr 29, 2014 13:16:42 GMT -5
Many thanks Chris. I don't want to go that fast so the stock armature will be fine! Size is more important than speed. Next project after the proxy Cooper!
Best Regards
David
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Post by slo on Apr 30, 2014 4:35:09 GMT -5
I see they have all different size windings for their custom winds and the option of double winds in different sizes too. What difference do the different sized wires make in the winds to motor performance and how do the double winds compare to single winds? Also what are the benefits of the epoxied ones as compared to not epoxied? I have a couple of Mashimas' on the way, do they have some magnetic traction ?
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