motor brushes ?

[John 77Participant @john77]

From my experience in 25 years in electrical maintenance. I have made small brushes from lager ones

I always used a file as emery paper dose leave particals in the carbon, there are different types of brushes some are plain carbon / carbon graphite / carbon graphite copper mixes if you use the wrong type you will get commutator ware Plain carbon are the most abrasive and the graphite type are the less abrasive. If you look at the original brushies you can get a good idea what type you need.

John

[John 77Participant @john77]

From my experience in 25 years in electrical maintenance. I have made small brushes from lager ones

I always used a file as emery paper dose leave particals in the carbon, there are different types of brushes some are plain carbon / carbon graphite / carbon graphite copper mixes if you use the wrong type you will get commutator ware Plain carbon are the most abrasive and the graphite type are the less abrasive. If you look at the original brushies you can get a good idea what type you need.

John

[HopperParticipant @hopper]

You can sometimes use the old dogde of putting a little piece of something on top of the old brush, between the brush and spring. Increases the spring tension and pushes the remaining carbon against the commutator.

A piece torn from a matchbox and folded up was the traditional roadside fix on DC motorcycle generators etc.

[HopperParticipant @hopper]

You can sometimes use the old dogde of putting a little piece of something on top of the old brush, between the brush and spring. Increases the spring tension and pushes the remaining carbon against the commutator.

A piece torn from a matchbox and folded up was the traditional roadside fix on DC motorcycle generators etc.

[HopperParticipant @hopper]

You can sometimes use the old dogde of putting a little piece of something on top of the old brush, between the brush and spring. Increases the spring tension and pushes the remaining carbon against the commutator.

A piece torn from a matchbox and folded up was the traditional roadside fix on DC motorcycle generators etc.

[Ian S CParticipant @iansc]

There are about as many grades of carbon brushes as there are motors to fit them to. One of my (old) books "Practial Design of Small Motors and Transformers" Edited by E. Molloy, 6th ed 1947 quotes 23 different grades, it depends on voltage, AC or DC, high or low voltage, and motor speed. It also depends on whether the mica is flush, or recessed. Back then a high speed motor was 10,000rpm, I'm sure its a bit higher on todays tools. Ian S C

[Ian S CParticipant @iansc]

There are about as many grades of carbon brushes as there are motors to fit them to. One of my (old) books "Practial Design of Small Motors and Transformers" Edited by E. Molloy, 6th ed 1947 quotes 23 different grades, it depends on voltage, AC or DC, high or low voltage, and motor speed. It also depends on whether the mica is flush, or recessed. Back then a high speed motor was 10,000rpm, I'm sure its a bit higher on todays tools. Ian S C

[Ian S CParticipant @iansc]

There are about as many grades of carbon brushes as there are motors to fit them to. One of my (old) books "Practial Design of Small Motors and Transformers" Edited by E. Molloy, 6th ed 1947 quotes 23 different grades, it depends on voltage, AC or DC, high or low voltage, and motor speed. It also depends on whether the mica is flush, or recessed. Back then a high speed motor was 10,000rpm, I'm sure its a bit higher on todays tools. Ian S C

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