Video

Great tutorial. Very good, clear explanation/examples.

I never knew how to calculate speeds & feeds when I ran manual machine tools. I’d look at the spinning cutter or workpiece and figure that’s a good RPM to start with. I’d adjust my speeds & feeds from there based on the surface finish, rigidity of the machine and workpiece setup and horsepower of the machine. I did have to calculate speeds & feeds when I learned how to program & run CNC machines. The actual speeds & feeds to cut are put into the machine program.

Who knew it was that simple to sharpen a parting tool? WAY easier than shaping a square piece of tool steel. Thanks for sharing. And yes, I'm still learning. 🙂

Been 2 years. Still making chips?

Third year Apprentice Millwright comin here 10 years after your post!! Much appreciated but I’d love to know the RPM you ran at

I totally disagree with his assessment of the Light House tool post. The parting blade is held in a rigid cast iron Armstrong holder. It's also on center with the bolt that holds the entire assembly. The tool is also Not hanging off the side like ALL QCTP's do. Even the 4 way turret type post is more rigid and has much less overhang than the QCTP. Yes, I know I'm old fashioned. I still like to Face Plate turn. Wakodahatchee Chris

thank you so much for the excellent explanation and demo

Awesome video

Beautiful shop!

Perfect! I was going to remove my crank and fit a 5v stepper motor with remote control but this is much simpler.

Very good demonstration and instruction! Thanks!

Great tutorial! Thanks

One very well done video. And the process was explained very well also. A true professional

Couple of weeks ago I bought a 6 tpi blade for cutting aluminium and it snapped on the first cut. I complained to the seller and got ignored, but today I watched your video, I made a jig and silver soldered the broken blade back together and it is better than when I first got it, Thank you Tom!!!

Hi, I've used a simpler "no calculator" method for a long time... (40 years) it depends upon knowing a few metric conversions, but you and I came up with a very similar answer to the spindle rate for your 5/8" cutter... (16mm is 0.63" no appreciable difference...) For a 100 FPM cutting speed, divide 100 by the cutter or workpiece diameter (so it applies to mills, drills, turning) then multiply that answer by 100. So, worked example- 100/16 = 6.25. Multiply 6.25 x 100, you get 625... Not so different from your 645? And the calculator was redundant... For a cutting speed less than or greater than 100 FPM, just pro rate... 500fpm? 625 x 5 = 3,125 RPM 50 RPM? 310 rpm 1/16" drill = 1.6mm 100 /1.6 = 96, 96 x 100 = 9,600 rpm. As you say, a starting point... But 40 years of using my simple formula tells me it works... And... 100 FPM is 30 metres/min, so you can do a fairly rapid mental approximation from metric to imperial (calculator free) When I started work, the old guys recommended these spindle speeds for drilling... 1,000, 500, 250 rpm for 1/4", 1/2", and 1" drills, respectively, pro rated for bigger and smaller drills, in mild Steel, run wet. I think some of them started out with high carbon steel drills. HSS and Super HSS, we could use 1,600, 800 and 400 RPM, wet. 60% of that speed dry... And none of it needs a calculator... (or pi)

Super valuable info even 10 years later. TY

Very informative. I almost broke everyone around me with climb milling lol

Is the pdf still available?

I had to come back and find you after a few years with a different username. Glad to see you're okay Tom. I know a guy on my gardening forum that lives in the UP. Known him for many years.

How does wire help?

This is the first video I found that talked about the clearance angle which I found to be the most important part. Finally got my lug drilled out

This is great, but emphasize: UNITS MATTER! The formula relies on surface speed in feet per minute and tool diameter in inches, resulting in spindle speed in rpm. DO NOT USE THIS FORMULA WITH METRIC UNITS--convert your values to sfm for the material and inches tool diameter, then plug in.

An excellent tutorial. Thank You

Azért ez a megoldás már jó .Majdnem ugyanezt a megoldást alkalmazom, csak én az élétől a hátlapot egyívben köszörülöm .Amit itt láttam az tökéletes

Tom.... I'm beginning to wonder whether or not the compound should be set at 90 deg minus the Helix angle?? Common practice says to move the single point at 60 or 60.5 but I'm now questioning that. I've done a lot of threading as per standard but gut feeling is saying to examine that compound angle and maybe who knows? I understand the argument about the tool cutting on the leading edge but if the tool is set correctly to the axis, ANY compound angle.... ANY angle, is going to to cut a thread. Only Depth will be reached after probably too much metal is removed sideways to get there. However, what's happening with each turn on the compound is that the Lead Screw to Spindle Ratio is now messed around minutely. This does not happen on the so called 90 deg plunge threading. The lead (and Ratio), remains exactly the same with every pass.... Even if there are 100 of them. The other thing is that if you view a thread from above with the 60 deg tool in position, it looks for all money that it should move forward directly on the Helix line..... ?

Dude, its been 12 years since you did this but you still just sped up how fast I indicated my mill vice back.

Thanks for the tips on using these. A point about the filing near the end - instead of rocking the file forward (away from you) over the sharp edge, start on the back side and rock the file back towards you. It feels weird at the start but only a tiny bit of practice to get the feel of it and you will find it’s far easier to make a very nice filed radius. Cheers, al

I made one years ago and funny enough found it again this weekend,so I’m sure to use it. Great stuff

Very interesting. Nice work. Thanks for sharing your experience.

Shouldn’t you have taken .009 off of both sides to ensure the pocket is center? Since you were .005 short on the backside? So in theory you’d be .005 off center

After watching several videos comparing various drill bit sharpening machines and the prices for them, the bench grinder seems the most practical by far since it can be used for other things, not just sharpening drill bits. So it will take some practice but from what I've seen the results are at least as good with the bench grinder and the most cost effective. Nice work on your video and explaining how to do sharpen bits.

Wow super impressed and I'd like to try this project myself I think I have the same bandsaw thank you for sharing your knowledge with the world I can speak for myself I really appreciate your knowledge

I retired with 34 years machine shop experience, with at least half of the years being a Milling machine specialist- meaning my entire work day was using Milling machines. A couple of additions I'll make is that the conventional Milling pull on the cutter can actually undercut the metal being machined. If the operator checks a part thickness and notes there's for instance, .200 of material left to remove and in turn positions the table to remove .200, the resulting cut cut may actually take off more than .200. This is because the conventional cut will "pull" the cutter into the material being machined. This result is compounded when using a long narrow cutter that bends easily. The operator may have a layout line on the top of the part but after the conventional cut completes, the bottom of the machined part thickness may be undercut while the top layout line is still visible . This is because the cutter bends in at the bottom during conventional cuts. The opposite occurs with climb cutting - the bottom of the cutter is deflected off of the part - resulting in a tapered thickness with the bottom being thicker. If one made a climb cut pass to the layout line on top, the bottom of the part may be thicker. If the operator floats the cutter back across the part in a conventional direction, the bottom of the part may be undercut. This will all vary with the length and diameter of the cutter along with how much material is being removed in one cut. Aircraft machine shop.

An excellent video. If I might make one suggestion, I would take a Sharpie pen and mark the top face of the tool before grinding. If you're new to this activity, it is quite easy to confuse which face you're working on - especially if you're grinding tools for working on brass bar where you don't actually need to grind away any of the top surface.

Thanks

👍👍Very good!

你好，能分享一下图纸吗？

Brazing over welding when joining bandsaw blades together. It's still sheet metal which is very hard to do. I also recommend brazing over aluminum so aluminum can take away excess heat from the torch. Yes, like a heat sink.

Nice carriage stop, nicely made and a great video, I also subscribed 😊

Still missing your videos...hope all is well up there in wonderland!

I'd already be done with my Drill Doctor.

Thank you for your experience on this topic.

I keep coming out with a taper on at least one side 😢 it's breaking my heart

This is exactly the type of video a novice (being generous here), like me needs. Haven't touched a lathe since shop class in jr. high school 50 years ago and unfortunately didn't pay as much attention as I should have. Interested in buying a small lathe for my garage, reading and watching video's but some of the most basic questions like how to position the cutting tool, which cutting tool to use and rotation of the lathe never get answered. Thanks for putting this together.

Hello Tom Just wondering what happened to ur video posting. It’s been too long since u have posted. Are you ok??

Thank you! This is what I needed. 🍻

4:20 "If you're using a lantern-type toolpost... good luck. They're not known for their rigidity, and your chances of successfully parting are GREATLY REDUCED using a lantern-type or rocker-type toolpost." Truer words were never spoken! Last weekend I needed to make a gib screw for my '42 SB 10R, and used a 1-1/4x4" bolt for stock. I decided to part the head off... there's an hour I'll never get back. I should have used a hacksaw, I'd have been done sooner! 😂 Next payday: a parting tool holder for my turret toolpost...

Thank you.

You´re website is offline?

thank you so much! super informative