pyrogeorge Posted March 15, 2008 Author Posted March 15, 2008 For the begining i will use only for S,C,Kno3 to make blackpowder,i think i won't have any problem.
mormanman Posted March 15, 2008 Posted March 15, 2008 No that won't work well at all, it's over priced, too small a size, and it could spark. About 1/2'' to 3/4 is ideal, like mormanman mentioned, 50cal Lead musket balls will work fine if you don't want to cast your own. .50 cal is about 1/2 an inch just saying. Pippi, like I said earlier buy that and then while using that make yourself on out of a washing machine motor.
pyrogeorge Posted March 15, 2008 Author Posted March 15, 2008 i think to buy lead balls (weight)which fisherman have,do you know this balls?Is the best alternative solution,do you agree?
TheSidewinder Posted March 16, 2008 Posted March 16, 2008 That depends. What fisherman use these days isn't pure lead any longer, at least not here in the USA. Ans that's thanks to the sniveling Liberal nannies in Government. pipipi, Brass might be less expensive than Lead in your country. Check and see. If it's a significant savings, Brass works fine.
Arthur Posted March 16, 2008 Posted March 16, 2008 My local scrap metal dealer sold me lead scrap from re-roofing houses for £1.50 a kilo. Be nice to him and he sells me the cleaner stuff without paint and cement. In the UK lots of old houses have the lead water pipe taken out and replaced with copper or plastic but lead pipe scrap usualy contains a lot of slag from the inside furring up due to hard water. All the local fishing sports shops sell moulds for casting your own weights from scrap lead. Ask in your locality, use google in your country, Use the search engine on ebay in your country. Alternatively make a rough sphere in plasticine or play dough and make a plaster mould (in teo halves!) from that and cast your own. LOads of people will sell you lead balls but the post/courier charge to your country may be excessive.
pyrogeorge Posted March 16, 2008 Author Posted March 16, 2008 i found a motor of a machine which pushing the water into high place,i don't know the name of this motor in english but i think that you understand this machine name.So,if this machine's is high speed is dangerous to make ball mill for black powder??May ignite or heat the chemicals?Your replys would be appreciate!
Arthur Posted March 16, 2008 Posted March 16, 2008 Not knowing the size of your mill drum makes things difficult! However a medium sized drum say 100 - 150mm inside diameter will suit rotating at say 50 to 100 rpm. Lots depends on the drum size and media size. Look at the motor choices that you have, look at the available pulleys and belts. Are you going to drive the rollers or the drun axis? A fast motor driving the mill rollers will drive the drum much more slowly. If you look carefully there are conveyor belt drive rollers with the motor INSIDE the roller. Often tey are used for the conveyors on supermarket checkouts. Look for a supermarket specialist shopfitter and see if they have any powered rollers ready for a second user! This reduces the risk of getting things pets or clothes caught in the belts and pulleys.
pyrogeorge Posted March 16, 2008 Author Posted March 16, 2008 The motor has 2800 rpm,is it safe or it heats the chemicals?
Arthur Posted March 16, 2008 Posted March 16, 2008 2800 is far too fast for the drum to rotate! try to work out how to make the drun rotate at 80rpm. Say for example a belt and pulleys to divide by 6 to drive one of the rollers then the roller to be one sixth of the drum OD so that you have a total divide of 36 and therefore about 77 rpm at the drum
pyrogeorge Posted March 16, 2008 Author Posted March 16, 2008 yes is fast for the drum,but can it cause ignision or heat 2800 rpm?Or it hasn't got any problem as far the heat?
pyrogeorge Posted March 16, 2008 Author Posted March 16, 2008 Say for example a belt and pulleys to divide by 6 to drive one of the rollers then the roller to be one sixth of the drum OD so that you have a total divide of 36 and therefore about 77 rpm at the drum i don't understand this..if it possible to explain more..
Arthur Posted March 16, 2008 Posted March 16, 2008 http://www.freewebs.com/cooperman435/equip...n.htm#132927364 Does this link work? The pic is a big ballmill -first speed reduction is the belt drive from the motor, the second reduction is the diameter of the roller to the diameter of the drum. If you try to spin a mill drum at 2800rpm the lack of mass balance about the axis will precipitate it flying off, ond/or the accelerating mass of media will cause the drum to break (centrifugal force) powering lead balls through you and everything you care about.
pyrogeorge Posted March 16, 2008 Author Posted March 16, 2008 thanks Arthur for your reply!Yes it works and i understand!!How many rpm is the best for ball mills??So it can make black powder(fine)
FrankRizzo Posted March 17, 2008 Posted March 17, 2008 What is the diameter of your milling jar (inside and outside measurements), and the diameter of the milling media?
pyrogeorge Posted March 17, 2008 Author Posted March 17, 2008 What is the diameter of your milling jar (inside and outside measurements), and the diameter of the milling media? i will make my own ball mill and first i collect informations and then to make finaly the ball mill correct.They hasn't got any standart rpm for ball mill?
TheSidewinder Posted March 17, 2008 Posted March 17, 2008 I'll let others provide the details but, IIRC, the "ideal" RPM depends on the diameter (2 x radius) of the barrel as well as the density and amount of whatever media you choose. This is grasping at what may be a faulty memory, but I *THINK* there's a fixed Rotational (Linear?) Velocity you want to achieve at the inside edge of the drum, but I'm not at all sure. I just plug in my Lortone QT66 and let it run for 24 hours, as I've posted elsewhere.
pudidotdk Posted March 17, 2008 Posted March 17, 2008 The RPM depends on the ID of the mill jar and media, and from that you are able to calculate the optimal speed.The bigger the mill, generally the lower the RPM. Passfire has some pretty good automatic calculators for it, I don't bother using formulas for it
Arthur Posted March 17, 2008 Posted March 17, 2008 Most barrels seem to rotate at between 50 and 100rpm. Big barrels rotate more slowly and contain a lot of media and weigh a lot.
Stinger Posted March 17, 2008 Posted March 17, 2008 Hi I bought my materials for a ball mill today.The motor I bought is a geared motor: 316 rpmtorque : 3000g/cm21W, 12V DC and current is 2,85amp.I also purchased stuff like a jar, ball bearings, a rod and clamps as well as a powersupply (11-15V/4A) http://img339.imageshack.us/my.php?image=s8000011sb5.jpg I know, this motor is small, but I hope it does the job.Milling media will be 1/2 inch hardened lead balls from a hunting store. Stinger
Arthur Posted March 17, 2008 Posted March 17, 2008 I have a roughly 90 rpm motor from that range directly driving a drum - works so far.
Stinger Posted March 17, 2008 Posted March 17, 2008 Hi I turned the motor on and there was quite a rattling noise, also, the LED of the powersupply flashes.... It is very loud I am a bit worried about that, since the motor is slow and only has 21W. Is anything wrong here? Stinger
pyrogeorge Posted March 17, 2008 Author Posted March 17, 2008 Hi I bought my materials for a ball mill today.The motor I bought is a geared motor: 316 rpmtorque : 3000g/cm21W, 12V DC and current is 2,85amp.I also purchased stuff like a jar, ball bearings, a rod and clamps as well as a powersupply (11-15V/4A) http://img339.imageshack.us/my.php?image=s8000011sb5.jpg I know, this motor is small, but I hope it does the job.Milling media will be 1/2 inch hardened lead balls from a hunting store. Stingercan you upload an image from your lead balls?I think to buy me too the same balls,is it safety this balls?? Also,how many lead balls or generally grinding media is ideal to have a ball mill?
nick2354 Posted March 18, 2008 Posted March 18, 2008 That depends. What fisherman use these days isn't pure lead any longer, at least not here in the USA. Ans that's thanks to the sniveling Liberal nannies in Government. Do you have any evidence to back your statement up? I ask this because I just bought some lead weights from my local K-Mart, and I was wondering if it isnt pure lead then it could spark?
Stinger Posted March 18, 2008 Posted March 18, 2008 Hi I go fishing, and here, like in denmark, it is not pure lead anymore,if i remember correct, they alloy lead with zinc I think.But that does not spark and should be fine for a ball mill. If you are not sure enough to use it in a ball mill, check ebay or your local hunting store for musket balls. PS: Has anyone created his ball mill the design united nuclear uses?Isn´t the jar directly connected with the motor? Stinger
TheSidewinder Posted March 18, 2008 Posted March 18, 2008 Do you have any evidence to back your statement up? I ask this because I just bought some lead weights from my local K-Mart, and I was wondering if it isnt pure lead then it could spark? Well, I can only assuming they're actually enforcing the laws they recently passed up here in Minnesota, which calls for a COMPLETE phase-out of lead in fishing sinkers and tackle. I forget the time-frame, but non-lead and low-lead tackle is readily available here. I see it in all the Sporting Goods stores, from the Mom and Pop variety on the shore of any given popular fishing lake, to the major outlets like Cabela's. I honestly don't know what is alloyed with them anymore, though. I haven't fished in years. As to sparking, I don't know for sure. I *THINK* you'll be fine, but I'm hopeful someone here can answer that definitively.
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