Roban Mechanics Motor Bearing Block

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Home › ✈️Aircraft › 🚁Helicopter › Helicopter Main Discussion › Roban Mechanics Motor Bearing Block

05-13-2020 04:36 AM 9 months ago

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Girard Ibanez

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Tucson, Arizona (formally from Guam)

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Roban Mechanics Motor Bearing Block

Anyone use the Roban bearing block for the motor?

I'm using a Scorpion 560kv motor. Two of the holes dont line up so I oblonged the holes on the upper motor plate.

The hard part was tightening two of the bolts and tension the belt.

Now the even challenging part, the motor shaft bearing support. This is by far an engineering nightmate IMHO.

The best solution to use a bearing block that mounts to the side frames. The same concept as the intermediate gear for the main gear. And an oblong hole to adjust the bearing block as rquired after belt tensioning.

Question;
Where can I get such a bearing block support.

What have you done to address this issue?
Team Thunder Tiger
since 6/2005 to 12/2014

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05-14-2020 01:04 AM 9 months ago

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Rojoalfa

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Punta de Mata, Monagas-Venezuela

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/
/

Your porposal is quite complicated. More moving parts in this narrow place.

Don't you think it is better to move the whole block doing some kind of guide on the frame?
The guide or groove in the same direction for tension.

/Saludos cordiales,

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05-14-2020 09:14 AM 9 months ago

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Girard Ibanez

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Roban uses a sliding plate that the motor rest on.

The sliding sits on top of the main plate.

There are two adjustable bolts that are use to tension the drive belt. These two bolts go through the sliding plate and screws to the main plate.

When the two tensioning bolts are tighten, it pulls the sliding plate.

From the pinion side or looking at the bottom of the main plate, there are 4 oblong holes that bolts to tighten the motor passes through.

The bolts pass through the main plate, then the sliding plate then to the threaded holes on the motor.

Before you put the 4 bolts on you need to insert the 3 L stud on to of the 4 motor mount bolts.

This L stud is used to fasten the motor shaft bearing support.

The problem I have is the recommended motor on Motion RC site is the Scorpion. The bolt pattern on the Scorpions are not symmetrical.

The bolt pattern on the sliding plate are symmetrical.

To use all 4 motor mounting holes you would need to obligate 2 if the sliding plate holes.

Since 2 of the holes are inward to the motor shaft, the motor pinion sits above the mounting bolt head which makes it difficult to access in order to tighten the bolt.

To make matters even dificult, the 3 studs for mounting the bearing support need to be aligned before you tighten the motor.

And even more difficult is the fact that only 2 of the three bolts that secure the bearing support to the L bracket can be used. Which means that the 3rd L stud cannot be used.

To summarize this nightmare, only 2 bolts can be used to tighten the motor and the bearing support not even used.
Team Thunder Tiger
since 6/2005 to 12/2014

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05-14-2020 09:23 AM 9 months ago

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Girard Ibanez

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Anyone build a AS350 or Huey from Roban?

Did you use a Scorpion motor?

If so, did you yse 4 bolts or 2 bolts to mount the motor.

Did you use the motor shaft bearing support?

Curious mind wants to know what you did or didn't do?
Team Thunder Tiger
since 6/2005 to 12/2014

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05-14-2020 10:38 PM 9 months ago

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Girard Ibanez

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https://rc.runryder.com/goto.htm?post=6736017
Team Thunder Tiger
since 6/2005 to 12/2014

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05-15-2020 12:25 PM 9 months ago

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barely can fly

rrApprentice

oxford ga. usa

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Have no idea how much room you have available but this what Mikado uses to support the motor shaft, available in multiple shaft sizes.
https://shop.mikadousa.com/04714-Mo...haft_p_673.htmlATLRC wrecking crew / NCRC

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05-15-2020 04:10 PM 9 months ago

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Girard Ibanez

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I wish there was a picture with motor installed.

Thanks for the suggestion ... will do a bit research.
Team Thunder Tiger
since 6/2005 to 12/2014

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05-15-2020 04:13 PM 9 months ago

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Girard Ibanez

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I got the idea ... Roban uses 3 studs or individual spacers whereas Mikado uses a semi circular base.
Team Thunder Tiger
since 6/2005 to 12/2014

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05-15-2020 04:18 PM 9 months ago

0Post 9

barely can fly

rrApprentice

oxford ga. usa

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It uses the two motor bolts to mount, if I remember you just have use longer bolts.ATLRC wrecking crew / NCRC

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05-16-2020 12:13 AM 9 months ago

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Girard Ibanez

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He nice thing about the Mikado is the surface area of contact support verses the 2 post support oc the Roban design.
Team Thunder Tiger
since 6/2005 to 12/2014

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