Machinist question
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Printed Date: 02 May 2024 at 9:35pm
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Topic: Machinist question
Posted By: Thad in AR.
Subject: Machinist question
Date Posted: 14 May 2020 at 7:35pm
| Just some random thoughts rolling around. I was thinking of making a couple wooden bushings then I got to wondering if a person can machine parts from composite deck boards? I’m gonna try next time we use some at work. Just to experiment. Would be much more weather resistant than wood. |
Replies:
Posted By: allisbred
Date Posted: 14 May 2020 at 7:54pm
My thought is it would be gummy and heat from friction would cause it it to fail as a bearing. Wood brgs were soaked in oil and certain type of wood. Anything can be machined if not a liquid, some materials are tougher 
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Posted By: JW in MO
Date Posted: 14 May 2020 at 8:05pm
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I have an old Trex 2X deck board I make stuff out of but I believe it is put together from recycled plastic. Used it under new porch post to keep them off the concrete to keep the bottom from rotting but don't know how it would work trying to turn it. Like earlier stated, watch the heat. ------------- Maximum use of available resources! |
Posted By: jaybmiller
Date Posted: 14 May 2020 at 8:54pm
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A lot depends upon the speed of the shaft or whatever is in the bushing. Low speed = not much heat...UHMW plastic would be better, or a bronze bushing in the plastic... One of those gotta know th eapplication first to decide what's the best material.... ------------- 3 D-14s,A-C forklift, B-112 Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water |
Posted By: thendrix
Date Posted: 14 May 2020 at 8:55pm
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If you're going to machine plastic use sharp HSS tools. If you get a lot of tool marks take a honing stone and just take the keen edge off. ------------- "Farming is a business that makes a Las Vegas craps table look like a regular paycheck" Ronald Reagan |
Posted By: DiyDave
Date Posted: 14 May 2020 at 9:09pm
I believe that trex IS UHMW. Saw something on how they turn UHMW recycled milk jugs into them deck boards... ------------- Source: Babylon Bee. Sponsored by BRAWNDO, its got what you need! |
jaybmiller wrote:Posted By: steve(ill)
Date Posted: 14 May 2020 at 9:28pm
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Deck boards are some type of pine or fir... very soft .... not good bearing material ------------- Like them all, but love the "B"s. |
Posted By: Thad in AR.
Date Posted: 15 May 2020 at 5:57am
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Posted By: Thad in AR.
Date Posted: 15 May 2020 at 5:59am
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Posted By: Tbone95
Date Posted: 15 May 2020 at 6:38am
Relatively low, you don't want unnecessary heat at the cut. If you can sharpen a carbide bit really sharp, you'd be OK. A carbide insert is not sharp enough to work well. It will work, but not great. You can really put a sharp edge on HSS. |
Posted By: Thad in AR.
Date Posted: 15 May 2020 at 6:51am
Thank you. I’m taking notes. I’m in the learning stages of HSS sharpening. |
Posted By: fixer1958
Date Posted: 15 May 2020 at 8:05am
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My father in law wanted some bushings made for some kind of old implement he had and we made them out of hedge. He said it worked and we did that a lot of years ago and haven't heard anything since. I know he still uses it cause he don't get rid of anything. |
Posted By: IBWD MIke
Date Posted: 15 May 2020 at 8:44am
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There is a composite product, Micarta. I'm not sure what exactly it's made of. It's sort of like wood but different. We used it a lot for fixturing at Maytag. I'm sure McMaster-Carr carries it. Machines pretty good, second the use of HSS tools for cutting this type of stuff. I would think it would work good for a chain tensioner type of application or similar where oak was used in the past. |
Posted By: thendrix
Date Posted: 15 May 2020 at 11:54am
Since you're talking notes, carbide tools, especially interested tools, have a less keen edge than HHS tools do. I've been told this is because carbide doesn't shear like HHS does, it's more of a beating action. The rounded edges on inserted carbide tools will do more "pushing" soft materials than actually cutting them. If this material is UHMW and you're milling it I would say with a 2 or 3 flute 1/2" HHS end mill on a manual mill you could run in the 1500 RPM range and be ok. A smaller end mil run a little faster and a little slower for a bigger end mill. Adjust your feed and speed according to your desired finish and what how it feels. When I used to cut plastics I used aluminum vice jaws with sharp or almost sharp dovetails cut in them. I found with straight jaws you kinda get a push upwards on the part from gripping on the corner. The dovetail grips above the corner and tends to hold better. Also with plastics, if you put a piece in a vice and tighten it then go to lunch, when you come back tighten the vice just a little. Like said before UHMW is basically a milk jug and it will form to pressure if left for a while. The good grip you had before lunch can turn into a loose projectile after lunch  ------------- "Farming is a business that makes a Las Vegas craps table look like a regular paycheck" Ronald Reagan |
Posted By: ac fleet
Date Posted: 15 May 2020 at 1:58pm
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Hard maple then pressure soak it oil! ---ALL of the old equipment used them. ------------- http://machinebuildersnetwork.com/ |
Posted By: CTuckerNWIL
Date Posted: 16 May 2020 at 10:02pm
I thought about hedge when I made a BEARING FOR MY OLD DISC. It's so dense, it might not soak up enough oil or grease to keep it lubricated. With a low speed and little use, it wouldn't have really mattered, but I grabbed what was close and easiest to get at and the mulberry has lasted for 4 years now. Just pump a couple pumps of grease in it every once in awhile. ------------- http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |
Posted By: 1951WDNWWI
Date Posted: 23 May 2020 at 11:12am
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Lignum Vitae wood is used on ships. Battleships, destroyers, etc... Very hard and self lubicating. It also has agriculture applications as bearings for disk and conveyors. https://lignumvitaesolutions.com/industries/agriculture/" rel="nofollow - https://lignumvitaesolutions.com/industries/agriculture/ |
Posted By: desertjoe
Date Posted: 23 May 2020 at 4:15pm
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Back in the day,,Macarta (sp) was used in several similar applications but was very expensive until the oil impregnated plastics kinda phased it out,,,
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Posted By: Thad in AR.
Date Posted: 23 May 2020 at 7:15pm
Joe I haven’t had a chance to try this yet but I plan to holesaw some blanks and give it a try. Should be very weather resistant. |