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Building Resources

Page 2 of 2

Here you will find tips and tricks designed to save you time, money and frustration

How to connect & protect a potentiometer?

You will damage a potentiometer if it exceeds its stops. To avoid the problem @Alexey worked out how to remove the stop and hence potentially save a pot: http://www.xsimulator.net/community/threads/how-to-remove-the-end-stop-in-a-potentiometer.7198/

Another option to avoid breakage is to use highly accurate Hall Sensors: http://www.xsimulator.net/community/threads/hall-effect-potentiometer.4948/

Keep in mind to prevent applying (shear) forces onto the pot
The best way to achieve this, is to mount the pot's support onto the motor itself.
@dedas made a simple solution to connect the pot to the axle of the motor by using a piece of rubber hose (oil) with 2 clamps.
Its flexible and works fine.

@Pit advises the use of standard "elastic coupling" or "flexible coupler" with @Nick Moxley recommending these:

12mm
https://www.aliexpress.com/item/3pc.../1636922680.html?spm=2114.13010608.0.0.rghwGK

12.7mm
https://www.aliexpress.com/item/3pc...o-12-7mm-Stepper-Motor-Shaft/32342989653.html

@Erwan960:

@bsft : Also on the back of a motor shaft, I set up in this case a single turn 360 deg pot so if the lever goes over, the pot doesnt break.

or with gears to use the full range of potentiometer

@eaorobbie suggest (if enough room), a simple lever connection:

or this from this post:

@RacingMat : it's important to avoid applying forces on the potentiometer. The bracket has to be flexible! and mounted on the motor itself

@noorbeast :

manually M8 tapped shaft

Note:
- with potentiometer, if you wish the best resolution, you have to gear!
- but with hall sensor (contactless potentiometer) like 6127V1A from BI TECH/TT ELECTRONICS,
you can choose 45° (90°, 180°) giving equivalent resolution but without gears
(Resolution: 0.088° for 360° travel, 0.011° for 45° travel )

_____________

You can solder connecting wires directly to the pot pins, with a video tutorial being found here:

Alternatively you can crimp a small slotted blade connector around the pot pin then solder, as @noorbeast explains here: http://www.xsimulator.net/community...ttach-to-these-pin-terminals.6892/#post-78217

[IMG]

____________________________________

linear to circular F.B. by @speedy ...
Concept :
converting the linear 2m. tape movement into a circular rotation that can be measured by the 10 turns FB pot ...
Components :
-2 m. spring measuring tape .
-10k Ohm 10 turns pot .
-Suitable dial knob for the pot axle attaching .
-Hot glue gun [epoxy resin is preferred] .
step 1- after taking apart the tape ... make a big hole of a bigger diameter than the knob on the "spring free" plastic side .

step 2- spare the plastic center hole for reattaching the "center spring screw support" back in place .

step 3- [ The tricky part ] cover the center with a little grease [ Vaseline ] ... Glue the knob centered on top of the rotating wheel " Note that the center screw is fixed to main stationary body and will not be glued with the knob " ...

step 4- Attach and Aline the metal tape start point to the actuator mechanism and calibrate the FB pot turns to the motion range correct length ...
Then tighten the FB axle to the knob side set screw ... then you'll have a linear to circular F.B. that can be used in any place
If you like going into corners in your actuator design use an old adhesive wheel support to corner the metal tape .

Use busted measuring tapes for decoration.8_thumb[6].jpg

_________________________________

@Hammered_Again's RV30 gear box housing for pot's 6127V1A180L.5FS + modified SMC3 code changes: https://xsimulator.net/community/threads/4-dof-pivot-point-sim-first-build.19706/#post-259570

[IMG]

: #13

Wiper motor => mandatory ground isolation

Follow the advice of @bsft or you will fry your Hbridge
ground isolation is mandatory!

Explanations:
it's mandatory because with 2 motors connected to ground, when the Hbridge will drive one motor reverse and the other forward, the 12V and 0V will be connected together through the structure
-> short-circuit!

@Zed: You actually want to disconnect the ground for use with H bridges. The whole reason to use an H bridge is to be able to reverse motor polarity so so it goes the other direction. When you reverse the polarity of the applied power, the motor frame can become “energized”. If it is mounted to a metal frame with another motor powered up the other polarity, you get a short from power to ground and can blow electronics. I used energized/power and ground to denote polarities, but it’s also +/- or however you want to think of it. In a car, the motors that use their frames as a connector all just run one way.

@bsft: from here

With wipers, a large passenger car is usually good or a small truck , but use 12v for 12v. DO NOT USE 24v motors on 12v, all you do is half the speed and half the power. Waste of time.
Yes you do need to earth isolate the metal body of the motor as well.

Follow @eaorobbie picture:
[IMG]

@insanegr: from here

in your case as someone said before you have to find which is ground - low speed- and high speed and mark them.(you don't need low speed at all only high speed) [IMG]

then test with a multimeter(buzzer Ω) that you don't have any contact between the case (body of motor) and three cables.if you don't hear anything you are OK if you hear the buzzer on the multimeter you have to isolate the motors.
1.get your motor [IMG]

2. open it [IMG]

3. find the brush that's connected on the body [IMG]

4. cut it

5. solder a wire directly on the brush [IMG]

6.close it and you are done [IMG]

: #25

DC motors shopping list

China - 12V24V worm small gear reducer motor 250-350w 25A available in 25:1, 30:1, 50:1, minimum order of 5, FOB Price: US $80 - 90 / Piece, Shipping to: Worldwide

http://dakemotor.en.alibaba.com/pro...2V24V_250W_worm_small_gear_reducer_motor.html

[IMG]

WG73BD76-1 Getriebemotor 73mm 2-24V 80W 30Nm 180U/min
cost EUR 54,95 + Shipping: EUR 16,99 DHL Paket International | More Details Location: Engen, Germany Shipping to: Worldwide

http://www.ebay.de/itm/WG73BD76-1-G...252006?hash=item33aeef52e6:g:nYMAAOSwYHxWNAJW

USA Bodine 42A3BEPM-E3 12 Volt VDC 41 RPM 5/8" HIgh Torque 23 Amps
cost US $57.20 + shipping cost

http://www.ebay.com/itm/Gearmotor-1...42A3BEPM-E3-/291306026001?hash=item43d3313411

[IMG]

Canada Worm Drive Motors, 12V DC, 150-160RPM 25:1
cost US $99.99 + shipping cost

http://www.ebay.com/itm/GEAR-MOTOR-...384?pt=LH_DefaultDomain_0&hash=item51bd392f00

[IMG]

Canada Worm Drive Motors, 12V DC, 75-80RPM 50:1
cost US $99.99 + shipping cost
http://www.ebay.com/itm/GEAR-MOTOR-...L-FEED-SIMULATOR-75-80RPM-50-1-/371596157992?

[IMG]

UK Worm Drive Motors, available Left & Right hand, 12V DC, 80RPM, Peak Torque: 30Nm, Gear Wheel Material: Delrin
cost GBP 65.00 Approximately US $103.21 + shipping cost

http://www.ebay.com/itm/12V-DC-Gear...893?pt=LH_DefaultDomain_3&hash=item58c73b3b85

http://www.ebay.com/itm/12V-DC-Gear...270?pt=LH_DefaultDomain_3&hash=item58c73b352e

[IMG]

Worm Drive Motor 12V/24V 200W, 180 RPM, 20Nm Torque
cost AU 109$ + shipping cost
http://www.motiondynamics.com.au/worm-drive-motor-12v-24v-200w-180-rpm-20nm-torque.html

SWF VALEO NIDEC ITT 404.458 gearmotor 24V DC 12N.m irreversible
(for reference only because it's discontinued now)
http://www.smolka-berlin.de/onlines...cteur_24V_DC__Offre_sp%E9ciale%21%21%21_/4398

12/24V 350W 22.5Nm Torque Ratio 50:1 (others available)
cost varies depending on specs, see here for some indications of cost and shipping: $155 - $210 depending on specifications.
http://longway.en.alibaba.com/produ...&edm_cta=read_msg&edm_time=realtime&edm_ver=e
[IMG]

Winches on ebay
cost 65$ up t0 100$
Do not use winches with more than 2000lb! (750 Watt) = 60A current, 120A peak
IMPORTANT: read here
www.ebay.com search item

: #32

Sim building tutorials

2DOF compact seat mover
from @pipis2015
http://www.xsimulator.net/community/threads/2dof-compact-seat-mover.6654/

2DOF arduino wiper from A to Z
from @racingmat
http://www.xsimulator.net/2dof-motion-simulator-truck-wiper-motor-playseat/

...

: #48