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Hello Hilmar, The Basic Pitch Diameter is an imaginary cylinder which passes through the thread at a point halfway between the crest and root. It is equal to the Major Diameter of the thread minus a single thread depth. It is the principle bearing point of the thread. Tolerances and allowances...

Hello Rich, I imagine that you could make a holder for your inserts that would work for some external threading applications. However, I think it would be difficult to use them on a shop made holder for internal threading. The difficulty will be in achieving the proper clearance or relief...

Hello Rich, In your first post you mentioned that the pitch of your thread was to be 28 -32 threads per inch on a 24 mm diameter bar. You didn't mention what the exact thread form was, so in case it is ISO Metric, I have attached a set of formulas for this thread form. I also have a Myford...

Hello Eric, They are dated 1978. Regards, Mike

Hello All, I purchased a pair of prints a few years ago that were done by or for The South Bend Lathe Co. that some of you may find interesting. I love the first of them because they combine two of my favorite subjects, steam power and a hydroplane. My family has been involved in hydroplane...

Hello again, I should mention that these formulas are all based on having the proper flat on the nose of the tool. In the case of a 60 degree thread of the American National thread form, this Width of Flat (W) = Pitch (P) / 8, Where P = 1/ N (Number of Threads Per Inch) or W = P/8 The numbers...

Hello again, Last one. Attached are the External and Internal 60 Degree Right-Hand Thread Set-Up sheets. I tried to download one PDF initially, but I had to break it up as it was too large. Regards, Mike

Hello again, I have attached several handouts that I made up for my students when I introduced the topic of single point threading on the lathe. There are diagrams that illustrate the lathe set-up for both external and internal right-hand screwcutting on the lathe as well as the formulas for...

Hello Rich, I have attached a few pages out of my notebook that may be useful. They include a diagram for lathe set-up and the relationship between Depth of Thread (DOT) and Depth of Cut (DOC). This may be helpful if your thread angle is different than 60 degrees (55 degrees or 47.5 degrees)...

Hello Rich, Is this a 60 degree thread form? If so, the following formulae apply: Internal Depth of Thread = .541/N (N = No. of TPI [Threads Per Inch]) Internal Minor Diameter = Major Dia. (D) - 2(Internal D.O.T.) or D - 2(.541/N) Note: This is used for single point threading (100% Thread...

Hello George, I have purchased ETM tooling for my milling machines and have been very happy with the quality and accuracy of their adapters and ER collets. The last time I needed an adapter that ETM no longer supplied, I tried Accu-Pro, which is available from MSC and was very pleased with...

Hello BillH, PayPal sent. Thank you very much. Kind regards, Mike

Hello All: The .736" diameter on the spreadsheet "Piston Diameter" may be referring to the diameter of the top of the piston above the oil ring which supports the ring lands, not the skirt diameter which would be more like .7485" or so for a .750" diameter bore. The smaller diameter near the...

Achim, Thank you for sharing your cam grinder design with us. It is an outstanding piece of engineering. What strikes me most as I look over all of your work that has been presented here is the elegance in simplicity you achieve. I am certain that you have given many builders the inspiration to...

Hello George, Beautiful work and a fantastic job of documenting your progress. I am thoroughly enjoying every post. Thank you for taking the time to do so, you are inspiring many with your efforts. With regards to your gear cutting set-up, did you climb cut this gear because it was brass...

Hello All: With regards to the PEC rules with the mis-prints... I worked as an instructor at our local vo-tech and when the enrollment and budget dropped, the school would look for cost savings where it could. One of the instructors was very good at finding deals and he found that PEC...

Hello Sid: How many passes are you taking and at what depths? You should take no more than a .005" depth of cut (DOC) maximum for your first pass or two depending upon the total thread depth. Then reduce the DOC as you progress, finishing with .001" and taking several 'free passes' or no...

Hello again: I just had another thought. If your part can accept it, why don't you try machining a thread run-out groove at the end of the required thread on your shaft. It can be machined with a parting tool or a grooving tool and in general needs to be 1-2 thread pitches wide and machined to...

Hello Sid: It appears that you lost your synchronization on your steel part and wiped out your threads. That can happen if you miss the number on your thread dial or if the part moves in the chuck. Since you don't have a shoulder on the shaft, it could have moved in if you went too far on one...

Hello again: Just wanted to say that I have all of the original paper work that came with my All American Die Filer when new (bought from original owner) and what is on the website referenced in my previous post is everything that there is. Sorry, for repeating the same information that shred...