The only Arkansas stones that aren't in existence now( At least no longer being mined) are washitas. Hard and soft black and translucent Arkansas are still mined. Dans is a great modern day supplier
Nice video, however cuts corners immediately (pun intended). Grinds way too fast and without HSS. This basically leaves 75% of the important information out. The geometry can be explained with a picture
My Diamond tool holder arrived a few months ago and I must say I am very impressed with the quality of the finish it produces. I have been grinding HHS tool bits for years but as I age my hand eye coordination is not what it use to be so I find the grinding fixture a great hwlp. A diamond hone to touch it up works great.
Kipping that drill in one spot all the time will ruin your grinding will right away. Then foy hawe to dress that grinding wheel a lot. Good luck with that
Hey Barry. Great video. I wonder if you would take the time to do a follow up or supplementary video talking about where the different stones are used specifically in the machine shop. The reason I ask is that I have now 2 drawers with an assortment of stones, but before I thin down my inventory and have just 1 drawer full, I want to make sure that I don’t get rid of a stone that I might need. Thanks. Derek.
"I find that 10 weight oil works just a well - - - -" NOT TRUE. NOT EVEN A LITTLE BIT TRUE Lubricating oils are worthless as cutting oils. They don't have the additives that make a cutting oil. Just to start off cutting oils and fluids have things in them just for cutting. Regular lubricating oils don't and that makes them about as useless as sand. Sulfur is the most elemental (no pun intended) additive for cutting steels. There are anti-wear additives, boundary lubricants, and extreme pressure additives such as Chlorinated Paraffin, Sulfatesm, metal deactivators, anti-mist or anti-foam additives. Try this. In a small lathe, the smallest you can find get a hunk of 3" prehard 4140 and trey to drill and bore a 2.750" bore in it with precision( work closer than 0.001") using the most desirable lubricating oil you can imagine. Then get some Oatey or Hercules cutting oil that dark stuff with lots of sulfur in it and get back to work on that steel. If you don't see the difference, well then you must be dead.
You used the wrong feed, DOC & speeds for the carbide tip, so it is not a fair comparison. In addition an HSS cutter properly ground would have done as good a job as the tangetial. Tangential cutters are for those who cannot sharpen HSS tools properly.
You could try pushing the punch through the shim on a block of Urethane. There will be no need to make a die. Like this method - ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-dOAVcJ1CCmY.html Probably best if you want the slug but could be handy to know.
Based on reasoning 29 degrees is a safety margin. Machining is a process of exact values where as you cannot error on the plus. Meaning that you cannot replace material once removed. 29 degrees is a form of "sneaking up". This difficult operation that takes time to master. 29 degrees allows one to achieve success from a novice perspective. As the novice Machinist masters the threading operation he/she will no longer need the safety margin. They will soon set their compound to prescribed 30 degrees as they will know their machine and its quirks. Any value over 30 degrees will over shoot the 60 degree thread profile, causing a jagged edge by a factor of one degree on each pass. The illustration does not focus on the resulting thread profile. 29 + 29 = 58 , 29.5 + 29.5 = 59, 30 +30 = 60 workable profiles. 31 + 31 = 62 stair steps to the right eating into the previous pass.....
I have two of these diamond (square) and a round one. They have a choice of HSS or bits with a Cobalt mix, which makes the bit much more wear resistant for cutting steal etc. A big plus is that to sharpen it only grinds one surface which also is much easier and the tool shape does not alter. All that happens is the piece of square or round only very slowly gets shorter-and using the grinding jig, it is perfect sharpen every time. I do put a small radius on the cutting tip using a very fine diamond hone (very cheap from China), I also just give the top ground surface a light finish hone, again with a very fine diamond hone. I use mainly a marine grade aluminium alloy used in ship building, fantastic stuff to work with also brass stock. The surface finishes are superb, works very well with nylon and other plastic stock that needs a very sharp tool for a good finish. There is less tool pressure on the workpiece too, so fewer ‘spring’ passes needed on hard materials in a small hobby lathe. A great product from all aspects. On the square (diamond) tool bit, I have the opposite end ground to suit fine metric thread cutting -0.75 and 1.0mm pitch, as a lot of adapters I make are camera lens adapters for my various home built telescopes. Southern Cross Observatory-Tasmania 42 South.
There is another trick with that gauge I never see used or mentioned. The point of the bit across the web there will be an angle, if you lay the gauge across the cutting edge the angle across the web should be close to the angle of the gauge so the point can push material out of the way, If the angle across the web is to straight it won't push metal out of the way and the tip of the drill bit doesn't want to cut.
Your description of why it is called a tangential tool is not correct. If the tool tip is at centre height, the only way it can be tangential to the work is if the front face is vertical. Simple geometry. If the tool face is tangential and it is not vertical, the tip cannot be at centre height. The cutting angles of a so-called tangential tool are just the same as a properly ground conventional tool. The advantages are that some tangential tools are more rigid than a normal overhung tool, the user does not have to be skilled in grinding angles, and the tool can be sharpened simply and needing no skill. There are too many myths surrounding the tangential tool, which is actually not tangential at all. I use one on my mini lathe simply for the convenience of it.
Hi there, for people who don't own a mill to manufacture a new plate, for the Grizzly 10X22 lathes, the tee plate is on their web page for $4.00 each plus postage. I bought 2 of them and re-drilled and tapped the new threads into one of the spares I bought. Since I don't own a mill yet, I had to go this route. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-zH_9ZCMikd0.html Also... I think this is an equally good tool post and probably is the exact same except for branding plus it comes with more tool holders and a knurling tool holder and tool and a boring bar holder. I know this video is old so this option from Grizzly vs Ebay may not have been available back in 2009. But in 2021 it is at least right now. Here is the link to the Ebay deal www.ebay.com/itm/BOSTAR-AXA-250-111-Wedge-ToolPost-for-Lathe-6-12-8PC-Tool-Holders/283687065990?_trkparms=ispr%3D1&hash=item420d111986:g:vq0AAOSwXfJf89uz&amdata=enc%3AAQAFAAACgBaobrjLl8XobRIiIML1V4Imu%252Fn%252BzU5L90Z278x5ickk7PdDazAlGltMLJlUhrWsDzEHyFC%252BIf0cwDPsy9qi8IzVt8%252BEWBbLdOq3s%252F6zBBTpOs2uRuxE%252F9M4BZF2LIplg2ocA2WNrSD%252B6M89EVDg9mFUKbcG9Zzrz001JOKXc3EXjRt3ftPJ%252Bd0GxduP1nCmiKl5rwWKcVrrIpRV%252FFT0xJLC3PVwewSHSZ8peoy3fW3rjMvlvBleYDaNAY1kRfnfR12YW9KvsJiWjDpmCoXTk%252F18oQrEp0thPiANsl2rHLb5OiCtDWUmrRXWWcmpnpobl4PP%252F7eUAyYoifciECYe69BORK8OatTyKs7GRbGBi3lGAmnP7Z6M3Q8Kjmv%252FKLFS2QFuSVIQ4V2vDvAW4qryq2yuvniTSRgKKB7wjDo7b18wY1ZMeN9AnaaF63UKRD8RwLixmpKF70aVjE8k4DXrgj6K%252Fe55HFL8QFNRyWkrkCClEpD6OGtycUXr4YJ1whkv8NOiwfDS6s7ueTTT9JyQVP4i5ds%252FI%252B56tCShpBiYKWUBmayDAgWq61cZOk41NPsTDM9cpRogkDqgi69YIUcNV2UeY8oy7M1f%252FNtNe8sAJt1H%252Bxk4M9gW%252BXMi9FNi9GSqeAU3JHWVBCfzJN6PRx%252F5EMiz6eO7jD9oH5LXCnrD0EPrnNsg26aa0wofSh6yulRq4gT%252FR46dhEsuIK2a8VLiZeZUudDJdsbmLWa%252FOWQZWIX0LPQwRNWyHQpv5Y1%252FS%252F4hmRwgnrW5FB9jLLLtjXlMjAHYnUSuRlKjxtOPGJS2vrTC%252BPu9z%252BYfKUBu3XzFTV89yGGVviX%252F5WiIMENjb1OuyS0%253D%7Ccksum%3A2836870659905bdf8e66391c43c48077093c3a7304c3%7Campid%3APL_CLK%7Cclp%3A2334524 Thanks Projects in Metal for helping us with this video.
ahh this brought some memories. one of them was when my friend's hand got caught in the machine cuz she was using gloves. only lost her nails fortunately. sweet memory, nevertheless
That was a very beneficial video for me. I have been trying to find out what stones I need to work in my shop. I am 56 years old and I found out a long time ago that you have to ears for listing and one mouth. In other words do twice as much listing and half as much talking. I can tell by listing that you well skilled and that you just gave me a lot of information that can help me many years to come. I want to thank you for your time to make the video. God Bless and have a great day.
