Gemstone Forum archive

Dave those motors are very desirable by people wanting to convert a drill press to variable speed but you must have the controller from the tread mill also.They can also be adapted to a mill or lathe for wood and/or metal. I would even be willing to buy it if all the parts are there and the controller still works. Pm me if interested

R2D is spot on

specifiicly  it  refers  to a rule in the 1872 mining act as the Prudent Man Rule

. Valid and Existing Rights Determinations

Holders of mining claims and sites located within lands later withdrawn from mineral entry must prove their right to continue to occupy and use the land for mining purposes. The owner must demonstrate they contain a discovery of a valuable mineral deposit and/or are used and occupied properly under the General Mining Law, as of the date of withdrawal and as of the date of the mineral examination. Mining claims or sites whose discovery or use or occupation cannot be demonstrated on the date of withdrawal or the date of mineral examination have no valid existing rights and will be contested by the Department.

1. The Prudent Man Rule was first defined in Castle v Womble, 19 LD 455 (1894), where the Secretary of the Interior held that: "Where minerals have been found and the evidence is of such a character that a person of ordinary prudence would be justified in the further expenditure of his labor and means, with a reasonable prospect of success, in developing a valuable mine, the requirements of the statute have been met."

2. The Marketability Test was first defined by the Secretary of the Interior in Solicitor's Opinion, 54 ID 294 (1933): "...a mineral locator or applicant, to justify his possession must show by reason of accessibility, bona fides in development, proximity to market, existence of present demand, and other factors, the deposit is of such value that it can be mined, removed, and disposed of at a profit."

switch to metal dop stick and use super glue my opinion the only way to go

Ray
I am a newbe to machining so I know where you are coming from cabbing is not as complicated as machining metal although I suppose it could be but that would be a nightmare. That being said  to figure the sfpm from the rpm is pretty simple it' simply  figure out the circumference of the wheel  C=3.14 X 8 ( C= 3.14 X D) then divide by 12 to convert to feet, then your sfpm will be(C X rpm ) so the sfpm of an  8" wheel would be sfpm 3.14 X 8"=25.12 then
divide by 12 or 25.12/ 12=  2.09 ft   then for a 1:1 pulley ratio for a 1725 motor it would be 2.09 X1725 = 36 sfpm. A lot of machines use a three stage steep pully with the driving pulley  being the same size a the driven.
Usually the first pulley for the motor and the shaft is around 2 in, then 3  , then 4. You only need the steep pulley on the shaft.

Cutting rocks is more of a feel it thing with more pressure with harder rock and lighter with softer rocks. What the others said is all true it's kind what works best for you thing so I guess it may be more complicated since you don't have predetermined speed etc. to use. 

I have been running a RR for years too, Since you have a lathe I would turn a longer shaft for it and you can have the start of a 6" cabbing unit. I have a 10" saw and 8" cabbing unit and can run both at the same time with a 1/3 motor. I'm not sure how big your Unimat is I have a 7x14 mini lathe that will do nicely for a 14" or bigger if I go through the head stock.

I have found that no matter how flat the surface seems coming off the saw there are highs and lows on the surface I'm talking in the thousands of an inch. The only way I found to get around this was to paint the flat with a magic marker starting at the 100 grit stage and sand until all the ink was gone, and repeated the process all the way through the sanding up to the polish. It was amazing how much more sanding was needed at each stage. I am assuming that you are using flat laps if you are using belts on the early stages you will never get a flat surface.

Covelite most probably from Butte Montana