heapsy
off to a rocking start
Member since August 2015
Posts: 22
|
Post by heapsy on Sept 18, 2015 10:26:07 GMT -5
I bought the wheels, and a few slabs yeaa, I have someone that will make the shaft for me. >> Only problem<<< still I have is which exactly pulley do I need to buy, and also how its attached to the shaft? Thanksssss
|
|
quartz
Cave Dweller
breakin' rocks in the hot sun
Member since February 2010
Posts: 3,341
|
Post by quartz on Sept 18, 2015 23:00:18 GMT -5
Wheels in the U.S. are typically run at 1725 R.P.M. Your motor should be as close to that as you can get. Both motor and shaft pulleys will then be the same size, and 2" [51 mm] in diameter at a minimum. If a motor isn't available near that speed, pulley sizes can be altered to attain it. Pulleys are attached to a shaft with a set screw in the pulley hub.
|
|
heapsy
off to a rocking start
Member since August 2015
Posts: 22
|
Post by heapsy on Sept 19, 2015 6:08:11 GMT -5
Wheels in the U.S. are typically run at 1725 R.P.M. Your motor should be as close to that as you can get. Both motor and shaft pulleys will then be the same size, and 2" [51 mm] in diameter at a minimum. If a motor isn't available near that speed, pulley sizes can be altered to attain it. Pulleys are attached to a shaft with a set screw in the pulley hub. Thanks so much ☺
|
|
heapsy
off to a rocking start
Member since August 2015
Posts: 22
|
Post by heapsy on Sept 24, 2015 3:48:01 GMT -5
I have found 1500 RPM and not 1725, if I buy that one what size of pulley would I need now??? Thanks
|
|
quartz
Cave Dweller
breakin' rocks in the hot sun
Member since February 2010
Posts: 3,341
|
Post by quartz on Sept 25, 2015 22:57:57 GMT -5
How big in diameter are your wheels? For example Diamond Pacific Pixie, Genie, and Titan all run the same rotational speed; 1725, this is three different amounts of surface feet per minute given 4", 6", and 8" diameter wheels. a 1:1 ratio [both pulleys the same size] might work well on your machine. To be exact about the speed, the shaft would have to be overdriven from the motor. Assuming a 2" [51mm] pulley on the shaft, the motor pulley would be 2.3"[58.42mm]. Whatever pulley size you get for the shaft, 51mm a good minimum, the motor shaft pulley needs to be 1.15 times larger in outer diameter. Remember too, this isn't rocket science, there is give and take on the 1725 R.P.M. figure. When you build, allow enough motor travel to enable you to experiment by adjusting speeds, by changing pulley diameters, without having to get a new belt with each change. What is the power rating of the motor you are looking at, or have? Likely expressed in KW, HP [horsepower] in the U.S.
|
|
heapsy
off to a rocking start
Member since August 2015
Posts: 22
|
Post by heapsy on Sept 26, 2015 11:02:02 GMT -5
How big in diameter are your wheels? For example Diamond Pacific Pixie, Genie, and Titan all run the same rotational speed; 1725, this is three different amounts of surface feet per minute given 4", 6", and 8" diameter wheels. a 1:1 ratio [both pulleys the same size] might work well on your machine. To be exact about the speed, the shaft would have to be overdriven from the motor. Assuming a 2" [51mm] pulley on the shaft, the motor pulley would be 2.3"[58.42mm]. Whatever pulley size you get for the shaft, 51mm a good minimum, the motor shaft pulley needs to be 1.15 times larger in outer diameter. Remember too, this isn't rocket science, there is give and take on the 1725 R.P.M. figure. When you build, allow enough motor travel to enable you to experiment by adjusting speeds, by changing pulley diameters, without having to get a new belt with each change. What is the power rating of the motor you are looking at, or have? Likely expressed in KW, HP [horsepower] in the U.S. Thanks dear. The wheels are for pixie 4" iv asked for one pulley to be 2.5"(65mm) for the shaft, and asked for the other if they have (in email, didn't get an answer yet)to be about 2.8" before I saw your reply, is that good? and the hp of the motor is 1/3 (will it be ok 1/3 or should I take stronger ) Thanks so much ☺
|
|
|
Post by Rockoonz on Sept 26, 2015 14:58:00 GMT -5
1/3HP will be fine for 4 inch wheels, the 6" Genie works with 1/4HP. My guess is that you will end up having to use the 2.5" pulley at the shaft and a 3" pulley at the motor. Since you are running 4 " wheels the slightly faster RPM will not be a problem. It will net you 1800 RPM on your 1500 RPM motor, which is 1884 surface feet per minute at the wheel surface instead of the 1806 SFPM of a Pixie. In comparison, the genie with 6" wheels runs 2709 SFPM and the 8" Titan runs 3612 SFPM.
|
|
heapsy
off to a rocking start
Member since August 2015
Posts: 22
|
Post by heapsy on Sept 29, 2015 12:44:23 GMT -5
1/3HP will be fine for 4 inch wheels, the 6" Genie works with 1/4HP. My guess is that you will end up having to use the 2.5" pulley at the shaft and a 3" pulley at the motor. Since you are running 4 " wheels the slightly faster RPM will not be a problem. It will net you 1800 RPM on your 1500 RPM motor, which is 1884 surface feet per minute at the wheel surface instead of the 1806 SFPM of a Pixie. In comparison, the genie with 6" wheels runs 2709 SFPM and the 8" Titan runs 3612 SFPM. Thanks so much ☺ just a bit confused, don't know what is SFPM I guess its surface feet per minute, but not really knowing about that, but I understood the rest. Thanks
|
|
|
Post by Rockoonz on Sept 29, 2015 22:13:00 GMT -5
heapsy you're right it is surface feet per minute, I just hate to type Looking forward to seeing your end result, sounds like you are doing your research and it will be a good one.
|
|
heapsy
off to a rocking start
Member since August 2015
Posts: 22
|
Post by heapsy on Sept 30, 2015 4:05:25 GMT -5
heapsy you're right it is surface feet per minute, I just hate to type Looking forward to seeing your end result, sounds like you are doing your research and it will be a good one. Thanks I promise I will
|
|
Fossilman
Cave Dweller
Member since January 2009
Posts: 20,685
|
Post by Fossilman on Oct 3, 2015 12:32:16 GMT -5
Welcome to the forum heapsy...Good luck on building this machine-anybody can do anything, if they put their mind to it...Thumbs up As stated earlier, post your progress as you go.........
|
|
heapsy
off to a rocking start
Member since August 2015
Posts: 22
|
Post by heapsy on Oct 3, 2015 14:56:53 GMT -5
Welcome to the forum heapsy...Good luck on building this machine-anybody can do anything, if they put their mind to it...Thumbs up As stated earlier, post your progress as you go......... ☺ thanks and I will, its going to take some time, but I will share when I do, I believe I can do it ☺
|
|
heapsy
off to a rocking start
Member since August 2015
Posts: 22
|
Post by heapsy on Oct 20, 2015 14:12:20 GMT -5
Hi again, I have more questions, I went to the shop to buy barrings and pulley and motor, the guy in the shop didn't want to help me and I had to leave I didn't knew * what kind of motor ? Single Phase? or what? and the motor is actually 1400 rpm and not 1500 (he said that some say its 1500 but its 1400) * also the belt I didn't knew what to get, I know I meed a v belt but there are many size there, and I don't know how far do I need to place the motor, is it depend only how far I want to put it? * also sealed pillow bearings there are many kind, shell I take the simple ones? (My wheels are 4" ) Thanks again
|
|
quartz
Cave Dweller
breakin' rocks in the hot sun
Member since February 2010
Posts: 3,341
|
Post by quartz on Oct 20, 2015 22:48:17 GMT -5
A single phase motor is what you want.
Motor location is your option, personally I put them as close to the back of the machine as I can to keep the unit compact. Be sure to locate the motor so adjustment to tighten the belt is available. Most motor mounts are slotted to accommodate adjustment. The belt and pulleys should be ~1/2" wide on the back [wide] side.
For the size of machine you are building, a pretty basic pillow block bearing should work fine. Then too, a better quality will generally outlast the cheaper ones, budget plays a part here. Get relubable bearings, a shot of grease every 3-4 months will add to their life.
Belt length is best determined after locating the motor, at least temporarily to ensure a proper belt length is available. Half the outer circumference of each pulley + twice the shaft center distance for the length. If you use the same diameter pulley on each shaft, then one pulley circumference + twice the center distance.
|
|
heapsy
off to a rocking start
Member since August 2015
Posts: 22
|
Post by heapsy on Oct 23, 2015 7:27:03 GMT -5
The belt and pulleys should be ~1/2" wide on the back [wide] side. Belt length is best determined after locating the motor, at least temporarily to ensure a proper belt length is available. Half the outer circumference of each pulley + twice the shaft center distance for the length. If you use the same diameter pulley on each shaft, then one pulley circumference + twice the center distance. Thanks so much for your reply, few things im not sure I understand, the pulley im getting will be 2.5" and 3" so what this mean:
"The belt and pulleys should be ~1/2" wide on the back [wide] side." Also this I don't understand:"Belt length is best determined after locating the motor, at least temporarily to ensure a proper belt length is available. Half the outer circumference of each pulley + twice the shaft center distance for the length. If you use the same diameter pulley on each shaft, then one pulley circumference + twice the center distance." Can you give me an example please? also the width of the belt I don't know which one to take. Thanks again
|
|
|
Post by Rockoonz on Oct 23, 2015 14:16:03 GMT -5
Belt should be a fractional horsepower belt as opposed to an automotive belt. When you get the pulleys take them with you to get the belt, the belt should rest in the pulleys so that the back of the belt is flush with the outside of the pulley. If the belt sticks out slightly that is OK but you don't want it so narrow that it fits inside the pulley. If you stay with the 2.5" and 3" pulleys computing your belt length works like this: Calculate the distance you want between the middle of the arbor shaft and the muddle of the motor shaft. Multiply this number by two. Add 8.6 inches or 219.5mm, which is the sum of the distance halfway around both pulleys. Do not add the motor mount until you can use the belt to ensure that it fits right, then mark and drill the locations for the mounting bolts.
|
|
quartz
Cave Dweller
breakin' rocks in the hot sun
Member since February 2010
Posts: 3,341
|
Post by quartz on Oct 23, 2015 14:19:41 GMT -5
V belts are tapered along the sides, the outside being wider than the inside, that is where the term "V belt" comes from. If your pulleys are ~1/2" wide inside the flanges at the outer edge, the belt you need will be an "A" or "4L" size [This a description of standardized widths], at least that's how they are designated in the U.S. "A" and "4L" belts are interchangeable in function. I think I over-complicated the length measurement. With the motor set where you want it in relation to the machine, the required belt length is the total distance as measured around both pulleys at the outer edge of the pulley, and the space between the pulleys. The way I put it the other day: 2.5" dia.x pi [3.14]= 7.85" circumference. Divided by 2 = 3.925". Likewise, 3" x pi [3.14]= 9.42", divided by 2 = 4.71". 4.71+3.925=8.635", round to nearest 1/2" is 8.5". This 8.5 + 2 times the center distance of the motor and arbor shafts will be the length of the belt needed. Hopefully I got it across better this time. I'll make an atttempt to do some drawing and get it here, much easier to grasp that way. I tried to open a Gates.com online catalog, but it stalls, maybe you can get it. Worldwide seller of power transmission belts. If you can come up with a catalog from a belt supplier or find one on the internet, all this is explained very well. See "Power Transmission" as subject.
|
|
heapsy
off to a rocking start
Member since August 2015
Posts: 22
|
Post by heapsy on Oct 25, 2015 15:21:58 GMT -5
Belt should be a fractional horsepower belt as opposed to an automotive belt. When you get the pulleys take them with you to get the belt, the belt should rest in the pulleys so that the back of the belt is flush with the outside of the pulley. If the belt sticks out slightly that is OK but you don't want it so narrow that it fits inside the pulley. If you stay with the 2.5" and 3" pulleys computing your belt length works like this: Calculate the distance you want between the middle of the arbor shaft and the muddle of the motor shaft. Multiply this number by two. Add 8.6 inches or 219.5mm, which is the sum of the distance halfway around both pulleys. Do not add the motor mount until you can use the belt to ensure that it fits right, then mark and drill the locations for the mounting bolts. Thanks, im not sure I understand but I think from both you and quarts I can figure it our somehow ill see later on
|
|
heapsy
off to a rocking start
Member since August 2015
Posts: 22
|
Post by heapsy on Oct 25, 2015 15:24:57 GMT -5
V belts are tapered along the sides, the outside being wider than the inside, that is where the term "V belt" comes from. If your pulleys are ~1/2" wide inside the flanges at the outer edge, the belt you need will be an "A" or "4L" size [This a description of standardized widths], at least that's how they are designated in the U.S. "A" and "4L" belts are interchangeable in function. I think I over-complicated the length measurement. With the motor set where you want it in relation to the machine, the required belt length is the total distance as measured around both pulleys at the outer edge of the pulley, and the space between the pulleys. The way I put it the other day: 2.5" dia.x pi [3.14]= 7.85" circumference. Divided by 2 = 3.925". Likewise, 3" x pi [3.14]= 9.42", divided by 2 = 4.71". 4.71+3.925=8.635", round to nearest 1/2" is 8.5". This 8.5 + 2 times the center distance of the motor and arbor shafts will be the length of the belt needed. Hopefully I got it across better this time. I'll make an atttempt to do some drawing and get it here, much easier to grasp that way. I tried to open a Gates.com online catalog, but it stalls, maybe you can get it. Worldwide seller of power transmission belts. If you can come up with a catalog from a belt supplier or find one on the internet, all this is explained very well. See "Power Transmission" as subject. Thanks, im not sure I understand but I think from both you and Rockoonz I can figure it our somehow ill see later on But you said something to draw it, that sound great I think it will be easier on me to understand, I hope you have time to do that for me Thanks
|
|
heapsy
off to a rocking start
Member since August 2015
Posts: 22
|
Post by heapsy on Oct 25, 2015 15:31:35 GMT -5
|
|