Source for Delrin bushings


I'm thinking of making Delrin bushings for my Clausing 5914 Varispeed
drive rather than buying the premade ones from Clausing at around $28
apiece. I didn't spot anything quite the right size on eBay. It
looks like the OD will be somewhere around 2" and will be bored to
about 1.750" I probably need one or two pieces about 6" long
Anybody got a favorite source for Delrin.
What epoxy or other glue sticks to Delrin? I need to glue them inside
a pulley sheave. They'll be sliding back and forth, but won't be
rotating.
RWL
Reply to
GeoLane at PTD dot NET
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When I repaired my newly purchased 5914 back in the late '90s, there were no traces of any green (or any other color) material on the chewed up pulley shaft and I had no idea that there was a special material on the shaft. I had not seen any discussion of the surface finish of the 5914 shafts on this list back then (this list was much more on topic and even the off topic were more technical and not as political back then).
I cut a keyway on the opposite side of the shaft and brazed up the surface of the shaft and then turned the shaft down in my 1920s vintage SB lathe. Since the shaft was now most likely undersize (it was too chewed up to be able to discern what the dia. of the shaft was originally, I chose to make my own bushings. I used an engineered bearing material, long since forgot the name, I was given the bearing material as an engineering sample that was supposed to be competitive to Vespel (Ve$pel, was outragiously expensive back in the late '80s). The bushings have help up well for occasional hobby use.
Personally, I see no reason to make your own bushings if you need to go out and buy stock - unless you are intent on spending more money (and time) or the remaining stock will be of some use for a future project.
Reply to
aribert
If I remember correctly, Delrin is acetal with short glass fibers added, maybe to improve abrasion resistence. Pure acetal might be a better choice.
Hul
GeoLane at PTD dot NET wrote:
Reply to
dbr
Delrin is Dupont's trade name for Acetal.
Reply to
John R. Carroll
Would readymades work for you?
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The last time I bought slippery plastic from McMaster, the adhesive recommended was Loctite 380.
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Kevin Gallimore
Reply to
axolotl
Does your bushing look like this?
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I'll hold on further comment until I get a reply.
Wes
Reply to
Wes
Do you realize that they have to be shaped in the exact certain way? They are not round.
i
Reply to
Ignoramus21666
I don't have the VS drive apart yet, but that's the picture I've seen of the bushings for Clausing drives. Actually, now that I think about it, I saw that picture on your page with the great write up of rebuilding your VS drive. Your write up gave me the courage to tackle mine. I got as far as getting the timing belt, countershaft and variable speed belt out tonight. I'll work on it a little over the next few evenings as I have time. My lathe is mid production run - circa 1964-65, so it shouldn't have the bronze bushings.
RWL
Reply to
GeoLane at PTD dot NET
I"m not sure what you mean Iggy. I have seen the picture of the plastic insert, and I see that it has a protrusion into the keyway, but I don't know why I couldn't make a delrin bushing and just leave the keyway as a slot in the bushing. I"d use Loctite or some other epoxy to hold the bushing in place. Maybe I'll understand better once I have the motor pulley apart and can see what you're talking about.
RWL
Reply to
GeoLane at PTD dot NET
I think that spending $28 is a complete no brainer.
i
Reply to
Ignoramus21666
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Well, I got it apart this evening and I can see what you're talking about. The keyway is part of the bushing, extending outward and the key isn't as wide as the slot in the sheave. The $28 bushing looks like the easy way out since parts are still available.
RWL
Reply to
GeoLane at PTD dot NET
John: True, Delrin is Dupont's product. Some varieties of Delrin contain glass fibres and others don't. Prior to your doubtful message, I had believed all Delrin varieties contained glass. Also, an application note found while checking Delrin's specs reccomended the glass filled version as a bearing. That might require some testing before believing, though. Anyway, I think I'll retract my warning.
Hul
John R. Carroll wrote:
Reply to
dbr
Just out of curiousity, was the old bushing white?
Wes
Reply to
Wes
Yup. It was the old white one and had split into two pieces. It's been awhile since I read your Clausing page, but I think yours did that too.
Did you keep a list of the seal numbers and bearing numbers when you rebuilt the hydraulics on yours? If so, that would make it easier for me to find those parts. Clausing no longer supports the round hydraulic lower cylinder, so I'm on my own for finding the seals for that.
I'm in the process of making an arbor for the motor pulley / hub. When that's done, I'm going to try doing the coating with JB Weld and 15% by volume of Molybdenum disulfide.
RWL
Reply to
GeoLane at PTD dot NET
I ordered the seals from mcmasters except for one I had to get from applied technology.
I can't remember exactly what went where but here are the seals I ordered at the time.
Note, I used oring filled lip seals since I figured they might not leak as easily.
The small oring I both both o section and quad rings. I ended up using the quad rings.
Below is what I ordered back then. Obviously measure your parts to make sure my numbers are appriopriate.
6540K165 Double-Seal Viton O-Ring AS568A Dash Number 010, Packs of 50 (Same as 6540K101) $11.96 $11.96 today
9464K15 Viton O-Ring AS568A Dash Number 010, Packs of 100 (Same as 9464K342) $6.45 $6.45 today
9505K22 O-Ring Loaded Square Profile Lip Seal 7/8" ID X 1-1/8" OD X 1/8" Height X 1/8" Width (Same as 9505K21) $3.27 $3.27 today
9505K21 O-Ring Loaded Square Profile Lip Seal Specify ID, OD, Ht: ID:13/16, Outside Diameter:1-1/16, Height:1/8 --- --- 2 weeks
9505K15 O-Ring Loaded Square Profile Lip Seal 3/8" ID X 5/8" OD X 1/8" Height X 1/8" Width (Same as 9505K21) $2.61 $5.22 today
9452K31 Buna-N O-Ring AS568A Dash Number 211, Packs of 100 (Same as 9452K342) $4.32 $4.32 today
HTH,
Wes
Reply to
Wes
Let us know how that works out!
Wes
Reply to
Wes
Wes, I got you guys lost here, are those seals for the two cylinder hydraulic system or for one cylinder?
Is that set of seals to cover all seals in the entire hydraulic system?
i
Reply to
Ignoramus21067
This is for the one cylinder slave system. I'm not so sure how complete. I searched my pdf file copies of prior mcmaster purchases near the time I rebuilt the drive.
Wes
Reply to
Wes
Thanks Wes. I need to get the coating on the hub, then I'll turn my attention to the seals. Where you had to buy packs of 50 and 100, would you like to sell some of them?
How did you remove the bearing on the end of the hydraulic cylinder without munging the brass fiting it sits on? I didn't try to remove that bearing yet, but I think it would be wise to do so in order to get the brass "plug" out and replace the single large o ring.
I probably need to replace the hose that goes from the master cylinder to the slave. Better to order that from Clausing or is that a generic that I can get cheaper from another source?
RWL
Reply to
GeoLane at PTD dot NET
I'd put some in an envelope and give them to you if I knew where they went. I'll look for them tomorrow but there is no guarantee I'll find them any time soon. My garage is full of 'treasure' so full I'm still looking for the 6" 3 jaw chuck that came with the lathe.
While you are figuring out a coating solution, I'll keep any eye out for some of my spare orings.
I can't seem to remember at the moment. I searched though my digital photos to refresh my memory. Didn't find anything. My Clausing manual shows a double cylinder slave and I have the single cylinder slave.
Any decent hydraulic shop can make another one. I'm running the original. Looks a bit shabby but doesn't leak.
Wes
Reply to
Wes

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