Tamiya mini cooper
#7906
R/C Tech Elite Member
iTrader: (10)
Today's questions are about diffs and servos...
Balll diff I've got a ball diff I use in my mini. It's kept clean and well lubed, but it's kinda crunchy. Any ideas as to why that might be? Maybe because it's tightened down quite a bit?
Gear diff I've heard of people shimming the gear diff for a mini. Any ideas as to what size of shim to use and where I might find some?
Essentially, I'd like to have smooth, predictable diff action, with a decent degree of lock up. Are those two thing mutually exclusive in minis?
Steering servo I read something this morning about someone using a mini servo in an M-03. I've tried this, but the servo is too small to reach between the two mounting points. Any ideas how I might accomplish this one? I thought about just building an adaptor of some kind, but haven't actually tried it yet.
Any ideas you guys have would be appreciated.
Thanks!
Balll diff I've got a ball diff I use in my mini. It's kept clean and well lubed, but it's kinda crunchy. Any ideas as to why that might be? Maybe because it's tightened down quite a bit?
Gear diff I've heard of people shimming the gear diff for a mini. Any ideas as to what size of shim to use and where I might find some?
Essentially, I'd like to have smooth, predictable diff action, with a decent degree of lock up. Are those two thing mutually exclusive in minis?
Steering servo I read something this morning about someone using a mini servo in an M-03. I've tried this, but the servo is too small to reach between the two mounting points. Any ideas how I might accomplish this one? I thought about just building an adaptor of some kind, but haven't actually tried it yet.
Any ideas you guys have would be appreciated.
Thanks!
#7907
monkeyracing,
Ball Diff: I build as per instructions and use lots of tamiya anti wear grease, this will make the diff very smooth. As Defmondo pointed out, do not over tighten otherwise you will strip the diff. Some people also insert an extra cone washer to make it a little tighter, however that may go against your TCS rules.
Gear Diff: Add thicker washers to each side of the diff, or if you have extras add a second washer to each side. The costly way to make the action stiffer is to pack with tamiya anti wear grease, however this loosens up after a short time. Just use the kit supplied as a guide for size. Whem you get new bevel gears for the diff, normally has replacement washers with it.
SERVO SAVER: I have recently fitted the Tamiya M-Chassis Aluminum Horn and Hi Torque servo saver to my Mini and it works great. It is the same as the kit supplied plastic horn in alloy and uses the Hi torque servo parts and springs. This will give the same throw as the original, but is now stronger.
When you use smaller servo's and servo savers you end up affecting your steering on the car. I use a full size digital servo. I have found that the plastic servo posts are better replaced with alloy posts. This limits the amount of flex when turning the steering lock to lock. Some also have four mounting screws for the servo, which gives more rigidity to the assembly.
Just my thoughts.
Calvin.
Ball Diff: I build as per instructions and use lots of tamiya anti wear grease, this will make the diff very smooth. As Defmondo pointed out, do not over tighten otherwise you will strip the diff. Some people also insert an extra cone washer to make it a little tighter, however that may go against your TCS rules.
Gear Diff: Add thicker washers to each side of the diff, or if you have extras add a second washer to each side. The costly way to make the action stiffer is to pack with tamiya anti wear grease, however this loosens up after a short time. Just use the kit supplied as a guide for size. Whem you get new bevel gears for the diff, normally has replacement washers with it.
SERVO SAVER: I have recently fitted the Tamiya M-Chassis Aluminum Horn and Hi Torque servo saver to my Mini and it works great. It is the same as the kit supplied plastic horn in alloy and uses the Hi torque servo parts and springs. This will give the same throw as the original, but is now stronger.
When you use smaller servo's and servo savers you end up affecting your steering on the car. I use a full size digital servo. I have found that the plastic servo posts are better replaced with alloy posts. This limits the amount of flex when turning the steering lock to lock. Some also have four mounting screws for the servo, which gives more rigidity to the assembly.
Just my thoughts.
Calvin.
#7909
KREATOR1,
You can fit a 21 tooth in without doing anything to the chassis, just bolt in the normal position for 20 tooth. Larger can be fitted, however you can only put one screw in to hold the motor.You would also need to use a spacer so that you do not strip the spur gear.
I have never tried this myself, but have seen it used. Was fast in a straight line, but couldn't corner due to excessive speed.
However this goes against the spirit of mini racing. Personnally I think its waste of time, but each to there own.
Regards,
Calvin
You can fit a 21 tooth in without doing anything to the chassis, just bolt in the normal position for 20 tooth. Larger can be fitted, however you can only put one screw in to hold the motor.You would also need to use a spacer so that you do not strip the spur gear.
I have never tried this myself, but have seen it used. Was fast in a straight line, but couldn't corner due to excessive speed.
However this goes against the spirit of mini racing. Personnally I think its waste of time, but each to there own.
Regards,
Calvin
#7910
Tech Master
iTrader: (23)
Join Date: Jun 2005
Location: wonderfull place called, MALAYSIA.
Posts: 1,592
Trader Rating: 23 (96%+)
KREATOR1,
You can fit a 21 tooth in without doing anything to the chassis, just bolt in the normal position for 20 tooth. Larger can be fitted, however you can only put one screw in to hold the motor.You would also need to use a spacer so that you do not strip the spur gear.
I have never tried this myself, but have seen it used. Was fast in a straight line, but couldn't corner due to excessive speed.
However this goes against the spirit of mini racing. Personnally I think its waste of time, but each to there own.
Regards,
Calvin
You can fit a 21 tooth in without doing anything to the chassis, just bolt in the normal position for 20 tooth. Larger can be fitted, however you can only put one screw in to hold the motor.You would also need to use a spacer so that you do not strip the spur gear.
I have never tried this myself, but have seen it used. Was fast in a straight line, but couldn't corner due to excessive speed.
However this goes against the spirit of mini racing. Personnally I think its waste of time, but each to there own.
Regards,
Calvin
#7911
R/C Tech Elite Member
iTrader: (10)
Nah, not concerned about the servo saver. I use Kimbrough large and extra large. Gotta love those things.
My concern is about how to line up the mounts on a mini servo with the mounting points on an M03 chassis. I hear of people using smaller servos, but haven't found any pictures or instructions on how they did it.
I'm thinking that gluing a couple of servo posts together (side/side) would add the extra bit of reach I need to make it happen.
Jim
My concern is about how to line up the mounts on a mini servo with the mounting points on an M03 chassis. I hear of people using smaller servos, but haven't found any pictures or instructions on how they did it.
I'm thinking that gluing a couple of servo posts together (side/side) would add the extra bit of reach I need to make it happen.
Jim
#7913
KREATOR1,
I have seen a 25 tooth pinion fitted into a mini. You only use one motor screw. The motor will need to be offset within the housing, meshed with the spur gear and then you place a wedge into the side of the motor, so that it can not move if you hit something. The other option is to drill out the motor screw holes and use a washer.
As I said, I have only seen it, never tried it.
Regards,
Calvin.
I have seen a 25 tooth pinion fitted into a mini. You only use one motor screw. The motor will need to be offset within the housing, meshed with the spur gear and then you place a wedge into the side of the motor, so that it can not move if you hit something. The other option is to drill out the motor screw holes and use a washer.
As I said, I have only seen it, never tried it.
Regards,
Calvin.
Last edited by caltek1; 12-19-2008 at 10:41 PM. Reason: grammer
#7914
monkeyracing,
I use the Kimbrough large servo saver on one of my mini's but I will be changing over to the new M chassis servo saver.
I have included a photo of it fitted to my mini. You need to use the Hi torque servo saver parts as well as the new horn.
regards,
Calvin.
I use the Kimbrough large servo saver on one of my mini's but I will be changing over to the new M chassis servo saver.
I have included a photo of it fitted to my mini. You need to use the Hi torque servo saver parts as well as the new horn.
regards,
Calvin.
#7915
Tech Fanatic
iTrader: (12)
Jim.....
Stop by the table and I'll show you the shimmed gear diff!!!! You can pretty much dial in whatever feel you want......if you know where/what to shim!!!
Big charity race tommorow.....I have to remember my camera.....
CU later,
R
Stop by the table and I'll show you the shimmed gear diff!!!! You can pretty much dial in whatever feel you want......if you know where/what to shim!!!
Big charity race tommorow.....I have to remember my camera.....
CU later,
R
Today's questions are about diffs and servos...
Balll diff I've got a ball diff I use in my mini. It's kept clean and well lubed, but it's kinda crunchy. Any ideas as to why that might be? Maybe because it's tightened down quite a bit?
Gear diff I've heard of people shimming the gear diff for a mini. Any ideas as to what size of shim to use and where I might find some?
Essentially, I'd like to have smooth, predictable diff action, with a decent degree of lock up. Are those two thing mutually exclusive in minis?
Steering servo I read something this morning about someone using a mini servo in an M-03. I've tried this, but the servo is too small to reach between the two mounting points. Any ideas how I might accomplish this one? I thought about just building an adaptor of some kind, but haven't actually tried it yet.
Any ideas you guys have would be appreciated.
Thanks!
Balll diff I've got a ball diff I use in my mini. It's kept clean and well lubed, but it's kinda crunchy. Any ideas as to why that might be? Maybe because it's tightened down quite a bit?
Gear diff I've heard of people shimming the gear diff for a mini. Any ideas as to what size of shim to use and where I might find some?
Essentially, I'd like to have smooth, predictable diff action, with a decent degree of lock up. Are those two thing mutually exclusive in minis?
Steering servo I read something this morning about someone using a mini servo in an M-03. I've tried this, but the servo is too small to reach between the two mounting points. Any ideas how I might accomplish this one? I thought about just building an adaptor of some kind, but haven't actually tried it yet.
Any ideas you guys have would be appreciated.
Thanks!
#7916
R/C Tech Elite Member
iTrader: (10)
monkeyracing,
I use the Kimbrough large servo saver on one of my mini's but I will be changing over to the new M chassis servo saver.
I have included a photo of it fitted to my mini. You need to use the Hi torque servo saver parts as well as the new horn.
regards,
Calvin.
I use the Kimbrough large servo saver on one of my mini's but I will be changing over to the new M chassis servo saver.
I have included a photo of it fitted to my mini. You need to use the Hi torque servo saver parts as well as the new horn.
regards,
Calvin.
My question is in regards to fitting a mini servo (not the saver, just the servo) to the M-03 chassis.
For example: I have a regular sized servo on the car now. I want to fit a HiTec 225mg, which is a mini servo to the car.
Can you offer any advice on that?
#7917
Nah, not concerned about the servo saver. I use Kimbrough large and extra large. Gotta love those things.
My concern is about how to line up the mounts on a mini servo with the mounting points on an M03 chassis. I hear of people using smaller servos, but haven't found any pictures or instructions on how they did it.
I'm thinking that gluing a couple of servo posts together (side/side) would add the extra bit of reach I need to make it happen.
Jim
My concern is about how to line up the mounts on a mini servo with the mounting points on an M03 chassis. I hear of people using smaller servos, but haven't found any pictures or instructions on how they did it.
I'm thinking that gluing a couple of servo posts together (side/side) would add the extra bit of reach I need to make it happen.
Jim
You can run a piece of carbonfiber 3/8' wide from original servo mounting holes on the chassis and drill 2 holes in the required position for the mini servo. This should work fine. You will need to shim between the carbon plate and chassis and also use servo mounts that sit flush with the bottom of the servo. Shimmed up correctly and it will sit at the same position as a std servo. You can also lower it a little if you want.
#7918
Jim,
Not sure why you want to run mini servo. I have seen a few of the standard servo's broken when hit by another mini. I would think these would not be as strong.
I did understand your question, just wanted to show the new mini aluminum servo saver fitted to a mini.
Sorry I have never seen a Mini here in aust fitted with a mini servo. it wouldn't meet our mini rules, built as per instructions.
regards,
Calvin
Not sure why you want to run mini servo. I have seen a few of the standard servo's broken when hit by another mini. I would think these would not be as strong.
I did understand your question, just wanted to show the new mini aluminum servo saver fitted to a mini.
Sorry I have never seen a Mini here in aust fitted with a mini servo. it wouldn't meet our mini rules, built as per instructions.
regards,
Calvin
#7919
monkeyracing,
I use the Kimbrough large servo saver on one of my mini's but I will be changing over to the new M chassis servo saver.
I have included a photo of it fitted to my mini. You need to use the Hi torque servo saver parts as well as the new horn.
regards,
Calvin.
I use the Kimbrough large servo saver on one of my mini's but I will be changing over to the new M chassis servo saver.
I have included a photo of it fitted to my mini. You need to use the Hi torque servo saver parts as well as the new horn.
regards,
Calvin.
The blue aluminium saver looks really cool though!