I like that you reversed engineered the original design process rather than just taking a photo. I enjoy that too. Now I'll have that diamond trick in my tool box if I run into something similar myself. Here's a quick shortcut for testing the fit of a shape like that. If you create a drawing from the part, you can print it on a piece of paper, cut it out with scissors, and have a test piece in seconds instead of waiting for a 3d part to print.
Nice video. I've been using TPU for making gaskets for a while now, and have had a lot of good results. Especially gaskets that wouldn't be possible to cut out by hand, like the ones that have some sort of raised lip, or other 3D shape to them.
Neat little project but I'd wipe the plate and block down with acetone or IPA and use a good automotive silicon gasket maker on it, but that's just me. I wonder how well TPU holds up against oil (no oil pressure in that area, just oil). After you run it awhile keep us informed. Interesting!!
From my research, it does fine in oil. It swells a very small amount in gas, but that's often considered a plus for gaskets, and several folks use it with gas as well.
I get that you're doing a functional print demo, but Loctite 518 is taylor made for that application. I think most of the bolts in a Detroit 60 Series could be pulled out and the things would be glued together with the 518 used on them. 😁
interesting! I had always heard it sticks too good, and figured something applied to the glass to minimize that would then ruin the "glassy" finish. Do you use anything as a release agent during or after printing?
Can you tell me why you hollowed out the gasket, the covering plate is solid right across, the gasket could be the same unless the centre of the bearing sticks out in which case it would rub on the steel plate too. Basically it just a blanking off device like I put in my EGR valve.
I'm not convinced by the long term thermal resilience of printed gaskets. Which is why I picked up a broken Scan n Cut and fixed it. In theory I can now design or somehow scan the shape, and watch the magic machine cut me a shiny (well, more mattishly papery) new one from some decent gasket material.
You should carefully check the TDS. Some soften as low as 60C. Unfortunately HDT isn't usually available so you're stuck with guesses based on melt index / vicat softening or empirical testing.
for something that large and simple, I'd just yolo it with some gasket material and an exacto knife. the real value I see in 3d printed gaskets would be for tiny, precise, complex designs often seen in small engines, carburetors, etc.
I'm guessing that the two screws on a thin blanking plate sealed leaks not much better than thoughts and prayers. The clamping force must go to near zero with such a distance between bolts and over time oil is sneaky. Originally there would have been a deep casting there that could distribute the bolt load with much less deflection.
That's a great point. My hope though is that since this isn't under any pressure, that the incredibly limited sealing force is still enough to keep the oil in in the case
were you were short material makes no matter really in most all cases i can think of but i do get it perfection ;} .lots of gaskets bought are close enough lots i used ..God/Jesus bless you much
I wish. This engine is from a Volvo DD25 roller. That's where the hydraulic traction motor mounts, and there's a machined ring that goes into that housing on the hyd. pump that I don't have. I'm putting this motor in a Geo Tracker, so I need a cover plate with a gasket here instead. I also had to make the cover plate, as I found none offered. Kubota's answer seems to be to use the water pump side cover without the hyd. pump drive instead. Unfortunately, those cost more than I paid for the whole motor :)
@@FunctionalPrintFriday interesting. It looks just like the ones we service. I bet they are the same as Cat or Cummins but since it’s a lovely Swedish engine they done cross reference
If you print the top surface concentrically instead of as zigzag, it will help the gasket hold back liquids.
Thx, that’s a great idea.
I like that you reversed engineered the original design process rather than just taking a photo. I enjoy that too. Now I'll have that diamond trick in my tool box if I run into something similar myself.
Here's a quick shortcut for testing the fit of a shape like that. If you create a drawing from the part, you can print it on a piece of paper, cut it out with scissors, and have a test piece in seconds instead of waiting for a 3d part to print.
Nice video. I've been using TPU for making gaskets for a while now, and have had a lot of good results. Especially gaskets that wouldn't be possible to cut out by hand, like the ones that have some sort of raised lip, or other 3D shape to them.
thx!
I as well for hydraulic pumps
Neat little project but I'd wipe the plate and block down with acetone or IPA and use a good automotive silicon gasket maker on it, but that's just me. I wonder how well TPU holds up against oil (no oil pressure in that area, just oil). After you run it awhile keep us informed. Interesting!!
From my research, it does fine in oil. It swells a very small amount in gas, but that's often considered a plus for gaskets, and several folks use it with gas as well.
I should attempt to 3d print a valve cover gasket
I watched another TH-camr who soaked a tpu gasket in gas for a year and it barely swelled.
TPU is one of the most chemical resistant plastics out there when bought from a good supplier! (if the data sheets are to be trusted)
I get that you're doing a functional print demo, but Loctite 518 is taylor made for that application.
I think most of the bolts in a Detroit 60 Series could be pulled out and the things would be glued together with the 518 used on them. 😁
I have printed TPU right onto glass. Smooth finish all the time :)
interesting! I had always heard it sticks too good, and figured something applied to the glass to minimize that would then ruin the "glassy" finish. Do you use anything as a release agent during or after printing?
I made a TPU gasket for a vacuum pump hose. It seems withstand the low pressure, no leaks so far.
My printer has a scanner for things like this. Then use it as a reference photo in cad and all you need is one measurement for scale
What didn't you scan your paper template and import the image into your CAD software?
Also, why did you think you needed to match the surface 100%?
Great question, I talk about that at 6:09 th-cam.com/video/ShAR3EIcrmU/w-d-xo.html
Nice model, what were your speed and retraction settings?
I use ZERO retraction for TPU. 1500mm/min, outlines at 55%, and first layer at 50% speed.
Can you tell me why you hollowed out the gasket, the covering plate is solid right across, the gasket could be the same unless the centre of the bearing sticks out in which case it would rub on the steel plate too. Basically it just a blanking off device like I put in my EGR valve.
I'm not convinced by the long term thermal resilience of printed gaskets.
Which is why I picked up a broken Scan n Cut and fixed it. In theory I can now design or somehow scan the shape, and watch the magic machine cut me a shiny (well, more mattishly papery) new one from some decent gasket material.
I was wondering how it's going to hold up against the heat. Will it get too soft against the heat?
TPU doesn't soften till ~120C. This area on the block shouldn't exceed ~105C (liquid cooled engine)
You should carefully check the TDS. Some soften as low as 60C. Unfortunately HDT isn't usually available so you're stuck with guesses based on melt index / vicat softening or empirical testing.
Would give it a max 100C that is kind of normal for pu...but could be lower
is tpu oil resistant?
for something that large and simple, I'd just yolo it with some gasket material and an exacto knife.
the real value I see in 3d printed gaskets would be for tiny, precise, complex designs often seen in small engines, carburetors, etc.
Did it hold up?
I still haven't put the engine into service, lol. So many projects :)
@FunctionalPrintFriday i know the feeling! Haha
I'm guessing that the two screws on a thin blanking plate sealed leaks not much better than thoughts and prayers. The clamping force must go to near zero with such a distance between bolts and over time oil is sneaky. Originally there would have been a deep casting there that could distribute the bolt load with much less deflection.
That's a great point. My hope though is that since this isn't under any pressure, that the incredibly limited sealing force is still enough to keep the oil in in the case
You R the "TPU Gasket Whisperer"... Just saying :)
thx!
were you were short material makes no matter really in most all cases i can think of but i do get it perfection ;} .lots of gaskets bought are close enough lots i used ..God/Jesus bless you much
Or just buy a gasket for $3.97
I wish. This engine is from a Volvo DD25 roller. That's where the hydraulic traction motor mounts, and there's a machined ring that goes into that housing on the hyd. pump that I don't have. I'm putting this motor in a Geo Tracker, so I need a cover plate with a gasket here instead. I also had to make the cover plate, as I found none offered. Kubota's answer seems to be to use the water pump side cover without the hyd. pump drive instead. Unfortunately, those cost more than I paid for the whole motor :)
@@FunctionalPrintFriday interesting. It looks just like the ones we service. I bet they are the same as Cat or Cummins but since it’s a lovely Swedish engine they done cross reference
Or print it for $ 0.12 worth of filament and entertain yourself for a couple hours
@@Leedledlee and suffer from a failed "gasket" after a few hours of running.