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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
Posted to rec.crafts.metalworking
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Another design/materials Q.....
On Mar 26, 3:19*pm, "Existential Angst" wrote:
fyi, the actual size of this particular slider is approx. 3/8 x 3/4, with a 1/8x1/8 rabbet on each side (so the captured sliding part is 1/4 x 3/4), with a 4.5" L Any class of materials I should specifically avoid? Idears, opinions? I suppose I could test various materials, by buying or making something of a power hacksaw, and just let various materials reciprocate for a few days, see what stuff looks like at the end. *Hopefully I won't have to go that route, tho. -- EA MSC sell UHMW poly in rectangular rods 3/8 inch by 3/4 inch by five feet long for $6.86 . The price is from an outdated catalog. So it is lkely to be a bit more than that. But not too much more as I think the raw materail is natural gas. MSC also sells UHMW wear strips in various extruded shapes. They also sell teflon wear strips and rectangular rods, but the UHMW poly is much cheaper. The fact that they sell UHMW poly wear stripn ought to give you a clue that UHMW poly wears well. MSC also sells UHMW poly tape made by 3M. But you might not like the prices unless you are going to use a bunch. The rolls are 36 yards long. Dan |
#2
Posted to rec.crafts.metalworking
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Another design/materials Q.....
wrote in message
... On Mar 26, 3:19 pm, "Existential Angst" wrote: fyi, the actual size of this particular slider is approx. 3/8 x 3/4, with a 1/8x1/8 rabbet on each side (so the captured sliding part is 1/4 x 3/4), with a 4.5" L Any class of materials I should specifically avoid? Idears, opinions? I suppose I could test various materials, by buying or making something of a power hacksaw, and just let various materials reciprocate for a few days, see what stuff looks like at the end. Hopefully I won't have to go that route, tho. -- EA MSC sell UHMW poly in rectangular rods 3/8 inch by 3/4 inch by five feet long for $6.86 . The price is from an outdated catalog. So it is lkely to be a bit more than that. But not too much more as I think the raw materail is natural gas. MSC also sells UHMW wear strips in various extruded shapes. They also sell teflon wear strips and rectangular rods, but the UHMW poly is much cheaper. The fact that they sell UHMW poly wear stripn ought to give you a clue that UHMW poly wears well. MSC also sells UHMW poly tape made by 3M. But you might not like the prices unless you are going to use a bunch. The rolls are 36 yards long. ================================================== ======= Is there a way to tell what a plastic is, or at least its class? I'm machining a hard-ish black plastic from a bunch of drops of a buddy of mine, fairly expensive stuff, machines OK (not great, stringy pita, have to drill holes .015 oversize to get "size"), BUT, it's 1,000% better than the alum slider. Don't know what it is, tho. I do like the black color, tho. Don't know if that's a characteristic of a plastic, or just a dye. I've got other stuff that feels "oilier", other blue stuff that feels a bit denser. Have no way of telling what these are, tho. With metals, you have grinding tests, density, scratch, bending, magnet tests, chemical.... are there such for plastic? Bring to a plastics house?? I've got an AIN not too far from me. My buddy says they have someone over there who can identify most plastics. I may have pcs of Blue Nylon 6 plate, and Black Nylon 66 plate. The black stuff works fine, so far. I'll address Ed's points later on. But so far, from my shot in the dark with this unknown stuff, it seems Ed may be right: ANYthing will do, compared to alum on alum!! lol -- EA Dan |
#3
Posted to rec.crafts.metalworking
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Another design/materials Q.....
On 26/03/13 23:23, Existential Angst wrote:
wrote in message ... On Mar 26, 3:19 pm, "Existential Angst" wrote: fyi, the actual size of this particular slider is approx. 3/8 x 3/4, with a 1/8x1/8 rabbet on each side (so the captured sliding part is 1/4 x 3/4), with a 4.5" L Any class of materials I should specifically avoid? Idears, opinions? I suppose I could test various materials, by buying or making something of a power hacksaw, and just let various materials reciprocate for a few days, see what stuff looks like at the end. Hopefully I won't have to go that route, tho. -- EA MSC sell UHMW poly in rectangular rods 3/8 inch by 3/4 inch by five feet long for $6.86 . The price is from an outdated catalog. So it is lkely to be a bit more than that. But not too much more as I think the raw materail is natural gas. MSC also sells UHMW wear strips in various extruded shapes. They also sell teflon wear strips and rectangular rods, but the UHMW poly is much cheaper. The fact that they sell UHMW poly wear stripn ought to give you a clue that UHMW poly wears well. MSC also sells UHMW poly tape made by 3M. But you might not like the prices unless you are going to use a bunch. The rolls are 36 yards long. ================================================== ======= Is there a way to tell what a plastic is, or at least its class? I'm machining a hard-ish black plastic from a bunch of drops of a buddy of mine, fairly expensive stuff, machines OK (not great, stringy pita, have to drill holes .015 oversize to get "size"), BUT, it's 1,000% better than the alum slider. Don't know what it is, tho. I do like the black color, tho. Don't know if that's a characteristic of a plastic, or just a dye. I've got other stuff that feels "oilier", other blue stuff that feels a bit denser. Have no way of telling what these are, tho. With metals, you have grinding tests, density, scratch, bending, magnet tests, chemical.... are there such for plastic? Bring to a plastics house?? I've got an AIN not too far from me. My buddy says they have someone over there who can identify most plastics. I may have pcs of Blue Nylon 6 plate, and Black Nylon 66 plate. The black stuff works fine, so far. I'll address Ed's points later on. But so far, from my shot in the dark with this unknown stuff, it seems Ed may be right: ANYthing will do, compared to alum on alum!! lol Search for "identifying plastics burn test" gives items like http://www.boedeker.com/burntest.htm . IIRC certain ones like PE and PP smell like a burning candle and can be differentiated by the density, one floats in water the other doesn't. Have you look at the Igus site like http://www.igus.co.uk/default.asp?c=gb&L=en as they do many different bearing and linear motion solutions so maybe they have something to suit your need. |
#4
Posted to rec.crafts.metalworking
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Another design/materials Q.....
In article , Existential Angst
wrote: wrote in message ... On Mar 26, 3:19 pm, "Existential Angst" wrote: fyi, the actual size of this particular slider is approx. 3/8 x 3/4, with a 1/8x1/8 rabbet on each side (so the captured sliding part is 1/4 x 3/4), with a 4.5" L Any class of materials I should specifically avoid? Idears, opinions? I suppose I could test various materials, by buying or making something of a power hacksaw, and just let various materials reciprocate for a few days, see what stuff looks like at the end. Hopefully I won't have to go that route, tho. -- EA MSC sell UHMW poly in rectangular rods 3/8 inch by 3/4 inch by five feet long for $6.86 . The price is from an outdated catalog. So it is lkely to be a bit more than that. But not too much more as I think the raw materail is natural gas. MSC also sells UHMW wear strips in various extruded shapes. They also sell teflon wear strips and rectangular rods, but the UHMW poly is much cheaper. The fact that they sell UHMW poly wear stripn ought to give you a clue that UHMW poly wears well. MSC also sells UHMW poly tape made by 3M. But you might not like the prices unless you are going to use a bunch. The rolls are 36 yards long. ================================================== ======= Is there a way to tell what a plastic is, or at least its class? I'm machining a hard-ish black plastic from a bunch of drops of a buddy of mine, fairly expensive stuff, machines OK (not great, stringy pita, have to drill holes .015 oversize to get "size"), BUT, it's 1,000% better than the alum slider. Don't know what it is, tho. I do like the black color, tho. Don't know if that's a characteristic of a plastic, or just a dye. I've got other stuff that feels "oilier", other blue stuff that feels a bit denser. Have no way of telling what these are, tho. With metals, you have grinding tests, density, scratch, bending, magnet tests, chemical.... are there such for plastic? Bring to a plastics house?? I've got an AIN not too far from me. My buddy says they have someone over there who can identify most plastics. I may have pcs of Blue Nylon 6 plate, and Black Nylon 66 plate. The black stuff works fine, so far. It sounds like delrin (acetal). Joe Gwinn |
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