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Do you mean tapered roller bearing or cylindrical roller bearing. I'm not familiar with the specific Grizzly mill but but there are two possibilities

Poly V or similar profiles are the way to go. J should work, but it is advisable to go through the engineering calculations to make sure. I'm attaching one design guide, not the one I was hoping to find but it should help. Note that on page 190 you can figure out the horse power per...

That is a nice looking upgrade! Do you happen to know your ratios for high and low? I'm not really sure why the builders of these machines even bother with gears when the mills aren't not suitable for high torque milling in the first place. Belt drives would even be cheaper.

it has been awhile since I dropped in. that spindle machining must have taken forever. Your tool indexer looks to be most interesting as is this whole build. keep up the good work.

Well that kinda sucks but at least you don't need to worry about the Wuhan Virus. 99.999% sure that you can find a use for them. If you don't you can trade them off to other model makers for different materials. This is far more difficult to answer. Are you able to hard mill and turn...

All I can do is wish you lots of luck. Finding filament based light bulbs has become a huge chore. We have a lot of comparators and other old optical equipment and have to search hard to find old bulbs these days at work. Frankly the quality isn't as good as it use to be either. You...

Just be extremely careful doing this as knocking the crank off TDC could result in rapid rotation of the crank and anything attached to it.

I've had good luck with plastic shim stock. Very easy to cut and if you have too, to free up a hand it can be held in place with tape. The nice thing here is that plastic shim stock can be had in "books" that have "pages" of various thickness which comes in handy around the shop. So buying...

I see nothing here that should have stopped you from posting! If anything it shows that there is always room for innovation and simple is often good. By the way thanks for the video also. I would consider a motor drive for a more consistent results but that would be trivial for anybody...

That is a pretty common approach. You can even buy drill press fixtures that supposedly help you do the same thing. At one time there was a vendor for fine tip hole saws that supposeldy work better in this sort of work.

This is a good question. I look at it this way the worse thing you can do to a spindle is to spin an arbor in the taper. If you buy that then the best thing is to make sure the taper is never "loose". Since I usually work with R8 based mills holding, cutters in collets, not having the...

This has already been covered well but it is worth pointing out that Unified Threads came about after WW2 due to the need for compatibility with US and British standards. There where standards before that but lets put it this way far too many standards. What isn't also well known is that not...

That nonsense about 70 years after the authors death is one of the more stupid things that cam from Europe as it was never that long in the USA. I can understand protecting the original author for a specific number of years and while he is alive but 70 years after his death makes no sense at all.

Thanks to everyone making Cabin Fever a success. I could almost carbon copy parts of my post last year where I was happy to make it back in one piece, Got caught in a heavy bit of snow driving through NY. As for the "pond issue", it would be a shame not to have the diversity of steam...

I have no trouble imagining this sort of operation. What I see is the tool working against the mechanics of the machine. Instead of compressing the various parts of the machine together you are effectively pulling them apart.

Lately the only parting I've been doing at work has been either hardened Thompson rod or a bit of 4340. Hardened rod absolutely requires that you be either exactly on center or a tiny bit below. If not the tool rubs. Now different materials will deliver different results so I will not...

Never even seen a C1! However back in the day (35 years ago now) I did work in a machine tool rebuilding operation and worked with a very talented machinist / tool builder to align milling machine heads to rebuilt mills. to put in the kindest way possible you want to be absolutely sure...

There are many issues here that need to be considered. Probably the biggest is that tools designed for human operation often are not amendable to mechanical augmentation. Sometimes you are far better off designing a purpose built machine that leverages the mechanical solution you choose...

I have to agree putting ones hands into contact with a rotating piece is asking for trouble. It will likely work fine until the day it doesn’t and blood gets loose. Now that being said sometimes it only takes a little pressure to remove nasty harmonics. In that regard the end of a wooden...

A little late to the thread but I’m not sure that people are stressing the importance of setting center height enough!! Setting your height via a live center is not good enough. The tool needs to be on center or a few thousands lower. I actually learned this at work on a machine bigger...