[Jozzer]

I'd go for about 1mm of advance, maybe a fraction more considering the vehicle weight and resulting current. Agni's need advance in response to more current rather than more speed..

Here's a pic of a cutaway holder and the sanding sticks we use. The square end of the stick is pushed against the armature - this ones getting a bit short, which puts fingers at risk!

[riwe]

Originally Posted by Jozzer

I'd go for about 1mm of advance, maybe a fraction more considering the vehicle weight and resulting current. Agni's need advance in response to more current rather than more speed..

Here's a pic of a cutaway holder and the sanding sticks we use. The square end of the stick is pushed against the armature - this ones getting a bit short, which puts fingers at risk!

Ok, just to clarify, does that mean you have 1mm of "space" between the timing marks? Like this:

| <---Timingmark on holder
.<-> 1mm
.......|<---Timingmark on end plate

Thanks again

Rikard

[Jozzer]

That sounds right - assuming the timing mark is actually at neutral
With a new holder fitted you should verify this, the marks may no longer be correct..
To do this, connect to a low voltage power source, either one with a dial for "current" or in addition to a DC clamp meter. Spin the motor up and adjust the holder until the lowest possible current is being drawn. Mark this as neutral.
Then, turn the holder AGAINST/INTO the direction of rotation until the marks are 1mm apart. I usually allow 1mm of advance up to around 300A peak, up to 2mm if the motor is to be abused at 400A+ for short periods..

Steve

[riwe]

Originally Posted by Jozzer

That sounds right - assuming the timing mark is actually at neutral
With a new holder fitted you should verify this, the marks may no longer be correct..
To do this, connect to a low voltage power source, either one with a dial for "current" or in addition to a DC clamp meter. Spin the motor up and adjust the holder until the lowest possible current is being drawn. Mark this as neutral.
Then, turn the holder AGAINST/INTO the direction of rotation until the marks are 1mm apart. I usually allow 1mm of advance up to around 300A peak, up to 2mm if the motor is to be abused at 400A+ for short periods..

Steve

Got it!

You are a genius!

R

[Jozzer]

Originally Posted by riwe

You are a genius!
R

Lol, I wish!

[major]

Originally Posted by Jozzer

Unfortionatly, I don't have sanding sticks in stock and am having trouble locating a good source for them - Major, do you know of a company that might sell commutator sticks to order?

A google turned up these:

http://www.goodmart.com/products/pen...esurfacers.htm

http://www.manvillemotor.com/cat/Com...es-C10912.aspx

But I thought there was an easy place. You have Grainger over on that side of the pond?

http://www.grainger.com/Grainger/wwg...rue&sst=subset

[Jozzer]

Originally Posted by major

A google turned up these:

http://www.goodmart.com/products/pen...esurfacers.htm

http://www.manvillemotor.com/cat/Com...es-C10912.aspx

But I thought there was an easy place. You have Grainger over on that side of the pond?

http://www.grainger.com/Grainger/wwg...rue&sst=subset

Thanks Major. I had written to Grainger but never got a reply.

Rikard, thanks for your order, the brushes will ship today!

Steve

[riwe]

Originally Posted by Jozzer

Thanks Major. I had written to Grainger but never got a reply.

Rikard, thanks for your order, the brushes will ship today!

Steve

Thanks Steve!

I got in contact with a Swedish company that specializes in DC-motor renovations, www.krama.se, today and the guy I talked to had good knowledge of different types of sanding sticks. Hopefully I'll go and visit the later today. I will ask where they get them and if they work with resellers.

Best regards

Rikard

[riwe]

Originally Posted by Jozzer

That sounds right - assuming the timing mark is actually at neutral
With a new holder fitted you should verify this, the marks may no longer be correct..
To do this, connect to a low voltage power source, either one with a dial for "current" or in addition to a DC clamp meter. Spin the motor up and adjust the holder until the lowest possible current is being drawn. Mark this as neutral.
Then, turn the holder AGAINST/INTO the direction of rotation until the marks are 1mm apart. I usually allow 1mm of advance up to around 300A peak, up to 2mm if the motor is to be abused at 400A+ for short periods..

Steve

Hi Steve,

What is the draw back from to much "advance"?

Best regards

Rikard

[Jozzer]

Originally Posted by riwe

Hi Steve,

What is the draw back from to much "advance"?

Best regards

Rikard

Hi Rikard,

Too much advance will lower optimum efficiency and possibly cause other problems at lower currents. Also worth pointing out that the more advance you use, the less regen current can be allowed (if the motor were to be used a generator you would in fact retard the timing for higher currents).

Kind regards,
Steve