aborza

2003-07-31 13:33:07 UTC

Thanks for the comment Lloyd,

But darn, I'm disappointed.

I want to be at the top of "The Very Best" re: a 1/2 gallon ball mill for

the making of best quality Meal/Pulverone and BP rather than in the middle

of good. I want to try to match or beat the "oomph" of commercial BP for

lift and break purposes. I know that I will have to experiment with

varieties of Charcoal, pressing, corning, etc. but wish to have the mill as

a constant at the highest level.

I have already purchased 302 stainless as well as brass media (both are .5")

and will make up some lead media soon.

Where did I go wrong?

sure

But darn, I'm disappointed.

I want to be at the top of "The Very Best" re: a 1/2 gallon ball mill for

the making of best quality Meal/Pulverone and BP rather than in the middle

of good. I want to try to match or beat the "oomph" of commercial BP for

lift and break purposes. I know that I will have to experiment with

varieties of Charcoal, pressing, corning, etc. but wish to have the mill as

a constant at the highest level.

I have already purchased 302 stainless as well as brass media (both are .5")

and will make up some lead media soon.

Where did I go wrong?

'Sounds like you did your homework!

Keep in mind that the speed issue does not require precision. The optimum

speed will vary considerably with different materials and weights of

media.Keep in mind that the speed issue does not require precision. The optimum

speed will vary considerably with different materials and weights of

The calculations you've done will drop you right in the middle of the

'good'range.

LLoyd

orderLLoyd

My first pyro project is underway. I have a suitable AC motor on hand. I

have purchased media. I have purchased a mill jar. I am now about to

have purchased media. I have purchased a mill jar. I am now about to

the sheaves, bearings, etc. to complete my ball mill. I have made some

calculations a la Sponenburgh and would appreciate a check out to be

calculations a la Sponenburgh and would appreciate a check out to be

I

ishave not screwed up. I would like the fastest milling possible with the

jarand media I have.

From Sponenburgh the RPM of the jar should be based on the ID of the jar

andFrom Sponenburgh the RPM of the jar should be based on the ID of the jar

the OD of the media. Mine are 6.75" and .5" respectively. So...

RPM = (.65) (265.45)/ SQRT (jar id - ball od)

RPM = (.65) (265.45)/ SQRT (6.75 - .5)

RPM = 69

1750/69 = 25.36:1

The drive shaft will be rubber covered and .75" OD and the mill jar will

beRPM = (.65) (265.45)/ SQRT (jar id - ball od)

RPM = (.65) (265.45)/ SQRT (6.75 - .5)

RPM = 69

1750/69 = 25.36:1

The drive shaft will be rubber covered and .75" OD and the mill jar will

7.25/.75 = 9.66666:1 or 9.67:1

Since I need overall gearing of 25.36:1 and drive shaft to jar gearing

Since I need overall gearing of 25.36:1 and drive shaft to jar gearing

25.36/9.67 = 2.623:1

A 2" sheave has a 1.85" pitch diameter and a 5" sheave has a 4.85" pitch

diameter (using an A belt). Using those sheaves the gear ratio the gear

4.85/1.85 = 2.623:1

total gearing = (2.63)(9.67) = 25.43:1 and

ball jar RPM = 1750/25.43 = 68.8 RPM

Also, drive and roller shaft separation should be about .75 of jar

diameter.A 2" sheave has a 1.85" pitch diameter and a 5" sheave has a 4.85" pitch

diameter (using an A belt). Using those sheaves the gear ratio the gear

4.85/1.85 = 2.623:1

total gearing = (2.63)(9.67) = 25.43:1 and

ball jar RPM = 1750/25.43 = 68.8 RPM

Also, drive and roller shaft separation should be about .75 of jar

So

Roller separation = (.75)(7.25) = 5.44"

Is all the above right? Any suggestions?

Thanks

Roller separation = (.75)(7.25) = 5.44"

Is all the above right? Any suggestions?

Thanks