Myself I wouldn't go with the acrylic shee mothod, I'd use a solid block. they do have 3" thick 12" diameter acrylic round (which is what i've decided to use)
after seeing the finish on my previos platter bonded with acrylic cement id...hight sugest not using layeys if you plan on keeping it clear. Tough if you were frosting it then I wouldn't see any problems with it myself.
after seeing the finish on my previos platter bonded with acrylic cement id...hight sugest not using layeys if you plan on keeping it clear. Tough if you were frosting it then I wouldn't see any problems with it myself.
Tal: " ... they do have 3" thick 12" diameter acrylic round (which is what i've decided to use) ..."
Any ideas for a source for these ?? I might try one myself.
Any ideas for a source for these ?? I might try one myself.
wood bushings
Just an interesting note regarding the wooden bushings.
I was up in northern saskatchewan last year and a family friend gave us a tour of an old hydro-electric dam in operation. Anyway we the giant tubine shafts (approx 20" diameter) were running in a super hard wood called Lignum Vitae. they last for several years which amased me. Not so practical for turntables though as i believe they have to be soaked in water at all times or it dries out.
I found this quote on a wood site:
"Lignum Vitae is considered the hardest commercial wood. With a hardness of 4500 it is roughly three and a half times as hard as red oak. This wood is not only extremely hard, but it is also extremely heavy, with a specific gravity over 1.0 it will sink in water."
Just an interesting note regarding the wooden bushings.
I was up in northern saskatchewan last year and a family friend gave us a tour of an old hydro-electric dam in operation. Anyway we the giant tubine shafts (approx 20" diameter) were running in a super hard wood called Lignum Vitae. they last for several years which amased me. Not so practical for turntables though as i believe they have to be soaked in water at all times or it dries out.
I found this quote on a wood site:
"Lignum Vitae is considered the hardest commercial wood. With a hardness of 4500 it is roughly three and a half times as hard as red oak. This wood is not only extremely hard, but it is also extremely heavy, with a specific gravity over 1.0 it will sink in water."
It was for many years a very common practice to use wood bearing on farm equipment. John Deere had a special shop devoted to making Oak wood bearing for use and replacement in the tail wheel bearing of all of their single, and double bottom plows and multiple Oak baerings on disc harrows. Circa mid 19th century until the early 1950's.
Source was common Indiana and Ohio River Valley Oak, turned on a ordinary wood shop lathe. John Deere even produced a manual outlining field manufacture and replacement using ordinary petrolium based wheel bearing grease.
Automobiles and heavy duty trucks of the turn of the 20th century also had wood bearings in front axles and elsewhere. Any sailor aware of tall ships' rigging and "block and tackle" will wax profoundly on wood as a bearing material, greased with whale blubber, impervious to salt water, etc.
Source was common Indiana and Ohio River Valley Oak, turned on a ordinary wood shop lathe. John Deere even produced a manual outlining field manufacture and replacement using ordinary petrolium based wheel bearing grease.
Automobiles and heavy duty trucks of the turn of the 20th century also had wood bearings in front axles and elsewhere. Any sailor aware of tall ships' rigging and "block and tackle" will wax profoundly on wood as a bearing material, greased with whale blubber, impervious to salt water, etc.
You used to be able to get Lignum Vitae (Ironwood) from Constantines in NY. As I remember it was arounf 90lbs/cu/ft. Ebony is about 75. Hardrock maple 60-65. Ironwood is very oily, think of oil impregnated sintered bronze. Expensive woodworker's planes have Ironwood bottom plates. It machines better than aluminum. almost like mild steel. Question: if the ball is at the bottom, underneath the shaft, ala Thorens, then you only need to fill the resevoir with a lube like Rem-Oil from Remington or Dextron Auto trans fluid. But if the ball is at the top of the shaft, don't you need some clever way of pumping the lube up to the top of the shaft?
makinson1 said:
I doubt that it makes any difference to noise or friction levels whether the 'point' contact of the shaft/ball is lubricated or not. The pressure at this point of contact is extremely high (even with a relatively low mass platter) and the surface area extremely low. Any lubrication will be forced away from the surfaces making contact.
Lignum Vitae was used for the prop shaft bearings in old steam ships. No lube on a bearing makes me shudder even if the theory seems correct.
my old man is a time served shipyard cabinet maker, the fireplace shelf in my folks house is made from Lignum Vitae, amongst other exotic woods.
nicked from British SHipbuilders on the Tyne, before ti chnaged hands, god bless privitisation....
nicked from British SHipbuilders on the Tyne, before ti chnaged hands, god bless privitisation....
re plastics, there's alwasy annealed vesconite, lower friction coefficient than wet ice....
bitch to work with.
bitch to work with.
sq225917 said:
I noticed the guys who make Vesconite do a line of premoulded bushings. MOQ is ten parts. I might be interested in getting hold of one or two if anyone else was; depends how much they are.
I asked them about glass filled Teflon. Apparently Vesconite is better (wudn't 'ya have guessed! 😉). I haven't checked the data sheets, but it may be a bit more resistant to compression and such than Teflon given that it's designed for ship prop and rudder bushings. The Vesconite to steel coefficient of friction is 0.08, which is pretty good considering Teflon (t3h bestorz) is 0.04.
They do a version called HiLube, which lubricates it's self like oil impregnated bronze.
makinson1 said:
Maybe you could use the Chrome Vanadium shaft of a screwdriver. Although, it (and tool steel) will be next to impossible to machine compared with some of the other possibilites; you'd probably need access to a cylinderical surface grinder to use those in custom profiles.
Although, if you were very careful with the sizes you might be able to get away with using a stock piece of drill rod from www.onlinemetals.com. They do ground and polished lengths of the steel.
Vesconite is harder wearing than bronze. The manufacturers found it lasts about ten times longer, without any lubrication.
i cnc'd a 1 1/8" bicycle headset out of vesconite when i was at Uni, it lasted me 3 years before it cracked, no lube,no cleaning, if i hadn't been such a weight weenie it would still be going strong today..
I've been trying to hunt down reasonable lengths of either Vesconite or glass filled Teflon.
Vesconite HiLube is available in premoulded bushings, so they'll probably be an okay option but, as I say, they have a 10 part MOQ.
I also found somewhere selling glass filled Teflon tubing, but the stock lengths are 2m and $200+ each. They also have a $250 MOQ for international orders.
I did find one place that supplies vacuum chamber equipment for labs that sells glass filled Teflon washers. They're 3/4" and £6.68 + VAT each. They also have a £35 MOQ. I'm not sure about the exact dimensions of the washers either. They're probably only about 1/4 - 1/5" thick, and I don't know if the 3/4" is OD or ID. I did ask.
I would agree that Vesconite is competition for glass filled Teflon based on what I've read so far about it, perhaps even better (harder wearing / less flexible). Might also be cheaper. Neither is easy to get.
Where did you get your's from sq225917?
Vesconite HiLube is available in premoulded bushings, so they'll probably be an okay option but, as I say, they have a 10 part MOQ.
I also found somewhere selling glass filled Teflon tubing, but the stock lengths are 2m and $200+ each. They also have a $250 MOQ for international orders.
I did find one place that supplies vacuum chamber equipment for labs that sells glass filled Teflon washers. They're 3/4" and £6.68 + VAT each. They also have a £35 MOQ. I'm not sure about the exact dimensions of the washers either. They're probably only about 1/4 - 1/5" thick, and I don't know if the 3/4" is OD or ID. I did ask.
I would agree that Vesconite is competition for glass filled Teflon based on what I've read so far about it, perhaps even better (harder wearing / less flexible). Might also be cheaper. Neither is easy to get.
Where did you get your's from sq225917?
Guess I'm not the first guy to think of the Chris King headset idea. How about a Thompson seatpost? Gey out that mountain bike junk box and see what else is in there! Mcmaster-Carr in Chicago will sell you pre-machined Tungsden Carbide shafts, bronze bushings, drill rod, ceramic and glass ball bearings, etc.
I cadged it from a mate who i kitesurf with who used to work for SP systems the carbon fibre manufacturers,no idea what they used it for.
unfortunately he's moved jobs
vesconite.com do it in 1m lengths, nearest supplier is SA.
unfortunately he's moved jobs
vesconite.com do it in 1m lengths, nearest supplier is SA.
Cadged? Is that a lesser crime than nicking? Or is Cadge the first part of beg-borrow-steal? We will now have to show the turntable world the amazing properties of lubes made by Phil Wood, the guy who invented the sealed hubs for bicycles.
http://www.philwood.com/
http://www.philwood.com/
- Status
- Not open for further replies.