Lol I will be using the motor you have daily. just found this. I definitely sent my motors to the right Guru
2 Likes
Can anyone give me the bearings used in cheap 50xx motors?
Hmm might be the same, given the motor Iām looking at has a 8mm shaft.
I was also kind of wondering about the 50mm motors with 6mm shafts.
-general info-
Bearing Naming Convention / Designation / Nomenclature:
Generally:
The designations of most SKF rolling bearings follow a system that may consist of a basic designation with or without one or more prefixes and/or suffixes
| 1st Digit Code | Bearing type |
|---|---|
| 0 | Double row angular contact ball bearing |
| 1 | Self-aligning ball bearing |
| 2 | Spherical roller bearing, spherical roller thrust bearing |
| 3 | Tapered roller bearing |
| 4 | Double row deep groove ball bearing |
| 5 | Thrust ball bearing |
| 6 | Single row deep groove ball bearing |
| 7 | Single row angular contact ball bearing |
| 8 | Cylindrical roller thrust bearing |
| C | CARB toroidal roller bearing |
| N | Cylindrical roller bearing. Two or more letters are used to identify the number of the rows or the configuration of the flanges, e.g. NJ, NU, NUP, NN, NNU, NNCF |
| QJ | Four-point contact ball bearing |
| T | Tapered roller bearing in accordance with ISO 355 |
.
| Suffixes | External design (seals, snap ring groove, etc.) |
|---|---|
| -RS1, -2RS1 | Contact seal, NBR, on one or both sides |
| -RSH2, -2RSH2 | Contact seal, FKM, on one or both sides |
| -RSL, -2RSL | Low-friction seal, NBR, on one or both sides |
| -RST, -2RST | Low-friction seal, NBR, on one or both sides |
| -RZ, -2RZ | Non-contact seal, NBR, on one or both sides |
| -Z, -2Z | Shield on one or both sides |
.
i.e.
628/8-2Z
6 - Single row deep groove ball bearing
28 - width/height series code, 16mm OD x 5mm width
/8 - bore diameter, 8mm bore
2Z - shield on both sides
*many manufacturers do things slightly differently. just enough to be confusing. but the above is a good start
8 Likes
The red paint / glue, is that to prevent the epoxy from de-laminating? And what is it? I have used a similarly colored spray on conformal silicone paint to water proof PCB before.
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Itās MG Chemicals #4228 red insulating varnish.
It keeps brake dust and debris from going between the windings and also dampens their vibrations. A side-effect is less heat removal, so for me it increases longevity and reliability, at the expense of slightly reduced maximum power throughput.
Luckily it comes in gallon size.
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I saw someoneās nipple get caught in this once.
Donāt press the motor against your chest in an attempt to let the rotor come down slowly.
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Heads up: this is incredibly difficult (bearing replacement) on a Sealed Maytech 6374. Absolutely cannot recommend trying to do unless you have an arbor press. Tolerances are tight
Maybe putting the bearings in your freezer overnight would be enoughā¦ hard to say
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There are some nice tidbits of information in here about repairing a broken winding
and the aspirin trick
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Nice asprin trick. any insulation left on makes soldering near impossible
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Great writeup, Iām looking to build a few of these for myself. Out of curiosity, did you ever test the power of the motor? Also, what thickness of wire/number of turns did you do?
1 Like
Flipsky bearings are listed as 6800 and 6900.
I thought they used 688ZZ?