L500 grips too tight - HeliFreak
Fun, Learning, Friendship and Mutual Respect START  HERE


Unregistered
Go Back   HeliFreak > R/C Helicopter Support > Mikado Logo Helicopters


Mikado Logo Helicopters Mikado Logo Helicopters Discussion


Reply
 
LinkBack Thread Tools Display Modes
Old 12-21-2012, 02:36 PM   #1 (permalink)
CHC Benefactor
 
Posts: 4,412
 

Join Date: Feb 2006
Location: Singapore
Default L500 grips too tight

Decided to get into a larger electric and went with a L500. I'm now remembering all the work I've had to do in the past to get the grips just right. Unfortunately, I'm not succeeding so far with my first Logo.

Basically, I'm having two problems.

One, the main grips I have installed as per the manual and the parts that came with the combo kit. One side is a bit tight and the other super tight. I have pushed the O-rings/dampeners as far into the hub as possible. I have seated the radial bearings as far in and straight as possible. I am pretty sure all parts are in the correct order. I have on one side over did the locktite which I corrected. I thought I had it solved and redid with locktite. I believe that was due to the spindle being further out on one side although I tried my best to make it even on both sides. I have only used the .5mm washer for each side of the hub. I haven't seen any additional ones in the kit. I saw a mention of going with 1mm but havent found the original thread. I noticed that the outer portion of the thrust bearing moves rubbing against the outmost washer. That seems to be a potential source of the friction in addition to the O-rings and I wonder how this design works as most spindle assemblies that I've seen so far (although not many) have the bearings taking the friction as everything that the bolt comes into contact with up to the bearing moves freely from the grip. Should it be in this design that the outer portion of the thrust bearing should move with the bolt thereby requiring enough room inside the grip to spin? Have tried pulling grips apart, not much difference. How smooth/free should I be able to get the assembly once done right? Should the grips fall under their own weight?

Two, same thing with tail grips, except much less tight although notchy.

Thanks in advance for any help on this. Please link to any old threads that would help sort this or provide more background information as I have not been following the Logo forum until recently.

Geoff.
Raptorapture is offline        Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 12-22-2012, 05:24 PM   #2 (permalink)
Registered Users
 
My HF Map location
Join Date: Apr 2010
Location: Essex County, NJ
Default

Geoff - I had the same exact issue on my Logo 500SE build a few months back. I had the darn things apart and rebuilt 5 times, thinking that I had missed a step or mixed around the trhust bearing parts. I mean the grips were tight and notchy. Just didnt seem right. I remembered that it did take some force to seat the thrust bearings in the grips but I hear that most of the folks had similar experience with the tightness. In the end, I ended up swapping out the LOGO thrust bearings with a set of Align bearings from Helidirect and voila....The grips were perfect. They finally were loose enough that they fell under their own weight. I think the tolerance of the Logo TB's are off 1cm , causing the tighness.
ToddM is offline        Reply With Quote Quick reply to this message
Old 12-22-2012, 05:47 PM   #3 (permalink)
Registered Users
 

Join Date: Mar 2008
Location: Lewisville, texas
Default

Mine feels great... At first they weren't... I used the spindle to seat all the bearings... Then made sure all 3 dampeners on each side were all the way in, if their not mine didn't seat right and one side was rubbing the head... But once I had all of the dampeners seated it worked great
michael88997 is offline        Reply With Quote Quick reply to this message
Old 12-23-2012, 11:00 AM   #4 (permalink)
Registered Users
 
Posts: 266
 

Join Date: Jun 2012
Location: Florida
Default

I didnt have any problems with the grip assemblies on mine. One thing you need to check is the two belt tensioner wheels that go in the frame. When I pushed mine in they were extremely notchy. I measured the thickness of the rubber bushings that go on the outside of the bearings and they were 2.4 mm. I sanded the bushings down to 2.3mm and the belt tensioner wheels spun freely with no up and down movement.
__________________
Logo 500 SE
Mini Vbar 5.3 Pro/Savox/690SX swash
Kontronik 100LV/Scorpion 4025-1100
Edge 603/92 ceramic lightning bearings
Duramax11 is offline        Reply With Quote Quick reply to this message
Old 12-23-2012, 12:00 PM   #5 (permalink)
Registered Users
 
My HF Map location
Join Date: Apr 2010
Location: Essex County, NJ
Default

The other thing that may be causing issues is some excess flashing inside the grips from the manufacturing process. You might want to take a look at that as well.
ToddM is offline        Reply With Quote Quick reply to this message
Old 12-25-2012, 11:33 AM   #6 (permalink)
CHC Benefactor
 
Posts: 4,412
Thread Starter Thread Starter
 

Join Date: Feb 2006
Location: Singapore
Default Update

Thanks for the info guys.

I have since reassembled the main grips and managed to get it pretty smooth and no longer tight. I had managed to get the locktite to overflow again on one side. After correcting that I was checking all the tolerances and it appears that the design allows for some room for the thrust bearing section. Somehow after verifying that extra space between the thrust bearings and the bolt, when reassembling things managed to stay that way (but not loose). Also, added grease between the spindle and the dampeners which may have helped as well with respect to the tightness.

On the tail, have managed to get one grip super smooth through reassembly while the other required replacing both radial bearings as I think I forced them too much to get a tight fit. Still a bit notchy on that side most likely due to thrust bearing not 100% smooth when checked separately.

Will let you know once tail thrust bearing replaced. Happy to get this far, can't wait till build complete and in the air! Stocked up on 4400mah batts in anticipation.

BTW - couldn't access the site the last few days due to what looks like DDOS attempts hence the late update. Don't know if there is some preference for access for some users (lcoation based?) as I could see people logged in but couldn't get there myself.

Merry Christmas.

Geoff.
Raptorapture is offline        Reply With Quote Quick reply to this message
Old 12-26-2012, 12:08 PM   #7 (permalink)
CHC Benefactor
 
Posts: 4,412
Thread Starter Thread Starter
 

Join Date: Feb 2006
Location: Singapore
Thumbs up

Managed to sort the other tail grip. Didn't need to replace thrust bearing. Turned out the same solution was required, ie. free up enough space between bearings and bolt. Managed to do that after flipping the spindle, ie grips on the spindle and reassembling the tight side. One side has slightly more free play than the other but most important both turn freely without any notchiness!

Geoff.
Raptorapture is offline        Reply With Quote Quick reply to this message
Old 12-27-2012, 04:04 AM   #8 (permalink)
Registered Users
 
My HF Map location
Join Date: Apr 2010
Location: Essex County, NJ
Default

Quote:
Originally Posted by Raptorapture View Post
Managed to sort the other tail grip. Didn't need to replace thrust bearing. Turned out the same solution was required, ie. free up enough space between bearings and bolt. Managed to do that after flipping the spindle, ie grips on the spindle and reassembling the tight side. One side has slightly more free play than the other but most important both turn freely without any notchiness!

Geoff.
+1
ToddM is offline        Reply With Quote Quick reply to this message
Reply




Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the HeliFreak forums, you must first register.
Please enter your desired user name, your REAL and WORKING email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself. Use a real email address or you will not be granted access to the site. Thank you.
Email Address:
Location
Where do you live? ie: Country, State, City or General Geographic Location please.
Name and Lastname
Enter name and last name here. (This information is not shown to the general public. Optional)
Helicopter #1
Enter Helicopter #1 type and equipment.
Insurance
Please select your insurance company (Optional)
Helicopter #2
Enter Helicopter #2 type and equipment.
Helicopter #3
Enter Helicopter #3 type and equipment.
Helicopter #4
Enter Helicopter #4 type and equipment.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On




Copyright © Website Acquisitions Inc. All rights reserved.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
 

SEO by vBSEO 3.6.1