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I use babbit bearings as a general description for hydrodynamic bearings of that type, not meant to imply the actual construction of the bearing itself. Basically an oil film bearing has a much higher load capacity than a ball bearing of the same outer / inner diameter and width. Mike

What is your ignition timing like? And what do you have for a flywheel? Sounds like it might be either to aggressive ignition and/or too little flywheel to keep it going.

I hate to suggest it but you could (almost) buy a complete lathe spindle cartridge from Alibaba for the price of bearings! https://www.alibaba.com/product-detail/A2-4-belt-driven-lathe-turning_60569883119.html?spm=a2700.7724838.2017115.32.a2e87b03Ng5jZE It probably is very close after...

My initial gut feel is that the ball bearing is undersized for the load. Looking at full size applications - 2 stroke boat motors for one - I've seen needle roller bearings on the connecting rod big end. Even in modern car engines they are using babbit bearings as the load is quite high at this...

I would recommend blatantly copying a spindle design from a lathe that already exists and works well. I have the drawings of my Standard Modern 1340 lathe (13" swing, 5MT & D1-4 camlock) and they use 2 tapered roller bearings together at the chuck end (actually a double row tapered bearing)...

+1 for Fusion 360. It is completely free for student / hobbiest use, even small business up to $100K / year. Its easy to learn, and there are tons of online videos to show you how to do things if you get stuck. My interpretation of 3D modelling is that instead of drawing a flat drawing (like...

Quite frankly all the Chinese made machines from Busy Bee, Grizzly, King, Precision Matthews, Bolton, etc are the same basic machine, some may be slightly better than others due to better on site QC / QA but it is a crap shoot. That's the issue - buy from China or go for something that is 3 to...

Which part of Canada are you in? I occasionally hear of a lathe going up for sale before it hits the general public through the local model engineering club / live steam club. Sometimes there are really great deals to be had on those machines. Grizzly do ship to Canada - but be aware that...

No idea on formulations for making your own belt, but have you considered modifying an existing belt to suit? For example, timing belts are available in a huge array of sizes - a 6mm wide belt can be as small as 120mm pitch length (~circumference). This could be used as is on flat pulleys...

IMHO the best guide for o-ring selection is the Parker o-ring handbook, freely available from their website and now its a bit more interactive as well. Here is the link to the section on reciprocating o-ring design / selection...

Go and look in the car care / appearance aisle of any major store - there should be a polish for aluminum wheels there. Here in Canada I've used "Mothers" brand polish for aluminum wheels, works a real treat but it is time intensive to do a large surface...

This is not true. My flame eater needs to warm up before it will run continuously. True that vacuum is created by cooling the ingested hot gasses, but if its too cold the gasses cool before the valve closes, reducing the vacuum developed and hence power.

What fuel are you using for the flame? I found that you need to use a good fuel, i.e. Methylated spirits (ethyl alcohol). I had tried rubbing alcohol (90% isopropyl alcohol) and had disappointing results until I switched to a better burning fuel. You may try with a butane lighter to see if...

the lathe is operated manually and rarely gets a duty cycle of 20% (i don't work too fast). I've never felt it get hot or even very warm. The mill, the VFD has a built in cooling fan that starts stops on its own, and I run it with the door open/ajar, its mounted on a wall away from the mill so...

I would say for the vast majorityof VFD's yes - you can reverse without programming. You don't even need to remote the panel as long as you don't need to see the digital display for speed. The VFD has input terminals for low voltage signals to control Forward / Reverse and variable speed...

I've bought twice from http://dealerselectric.com/, first for my mill and second for my lathe. The first was a GE / Fuji brand and works fine - even has bells and whistles like Modbus serial remote control capability. The second was a very basic Teco model that does the job on the lathe. I...

Why does the crankcase need to be round? Is it aesthetics or are you trying to be as light as possible? Either way, without casting it as one piece it will be difficult. how about this? Turn the cylinder for the piston down from a larger diameter and cut a saddle in it? Mike

As mentioned a few posts up, check in the downloads section, I put up some drawings. http://www.homemodelenginemachinist.com/downloads/d1-4-rotary-table-adapter-324.html If you still need more info shoot me a PM. Mike

One of the considerations you haven't mentioned is what you will be machining. This will drive the consideration of holding torque and moving torque. You don't get a torque multiplication effect of 6:1 though with this setup unless you are machining at the very center of the table. Inside the...

Plastic, metal rubber - as long it works. I'm using large plastic pulleys (80T) on my cnc mill conversion (have a small aluminum hub), been fine for years. The belt is rubber. Don't get caught up in flash and bling for something that doesn't need it. Another way of thinking - if the rubber...