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| unc1esteve:
BangkokMick, I received my book 'Screwcutting In The Lathe' and have skimmed through it several times. Lots of good, useful information, especially for cutting a thread to specifications. I have several other books from this series that I find useful. I am an old man and I like referring to the hard copies. I have used 'Gears and Gear Cutting' many times. It did not, however, have a description of the procedures of cutting threads with the straight in method or the top slide method. Machine Shop Practice, volume 1, K E Moltrecht, has a step by step description of the two procedures. How to books such as Machining Fundamentals, John R Walker, also explain the steps involved. Books like Machine Shop Trade Secrets, James A. Harvey, add many useful tips. Though I have not seen a reference to the way I sharpen my tool bit. I have been thinking a lot about threading since I made my post. It seems so easy for me to make a thread but Why is it easy? I remember the first thread I cut. 1" x 8tpi. I just followed step 1, step 2, etc., after doing research, (reading). But again, why is it easy? I think about Stilldrilling's comment about never seeing a set over top slide. George H Thomas, The Model Engineers Workshop Manual, gave a good description of thread cutting and also a quick, retracting tool holder. I have no references from the gentleman that called himself Tubal Cain. I would like to start collecting his books. I have come to no conclusions. But I am going to make a rapid retracting lever for my lathe's cross slide. I think this would be of benefit for more than cutting threads. |
| andyf:
--- Quote from: unc1esteve on July 18, 2013, 06:20:55 PM ---BangkokMick, I received my book 'Screwcutting In The Lathe' .... It did not, however, have a description of the procedures of cutting threads with the straight in method or the top slide method. --- End quote --- My copy does, Steve, though it doesn't take up much room - pages 136 to 140. A bit hard to notice after your brains have been boiled by the preceding pages of mathematics! Andy. |
| Bangkok Mick:
My copy was also waiting for me when I got home from work yesterday along with two other books on lathe works from the same series. I have only had time for a flip through each book last night but will look for the info on the straight in method on pages 136/140 when I get home today. As I am using small diameter brass most of the time I guess this method will be a useful one to adopt but will also practice the 60 degree compound method for when I start cutting harder materials. All in all from my cursory look through I see a lot of good tips and ideas in these books so will have some home reading to do over the next couple of weeks. Cheers Mick |
| unc1esteve:
andyf, Mick, I did read section 8, but it was not the kind of step by step instruction I was looking for to refer to. I find threading to be no more or less difficult than any other process on the lathe. It is just a mater of manipulating this lever or dial in a certain order. Metrics on my lathe is just a matter of changing one gear. What I am trying to understand are statements like Neotech's about learning to cut threads to be a 'damn struggle' when I do not find it a struggle. I enjoy cutting threads and am thinking about his struggle. For instance depth of cut. I use a chart that was printed in a popular magazine that shows a standard depth for a standard number of threads. Set the dial to zero and then cut to depth. I am pleased that Mick finds my suggestion about 'Screwcutting In The Lathe' to be of benefit. Mick, I was in Thailand when I was in the Army many lifetimes ago. A beautiful country with more beautiful women. I was in Bangkok in '69'. I can not remember being that young. Bookdepository has several volumes by Tom Walshaw, aka Tubal Cain. He was refereed to in a post I made about lathes cutting a concave. |
| lordedmond:
Set over screw cutting well evan with a big Colchester lathe its still done, if you are un clear how the taper was cut he has a hydraulic tracer unit fitted take a look he explains it and shows how sets up the machine evan down to the reason for the position of the cross slide handle , also note the dial gage to show the total in feed I do not know if its in one of the above but he get on his high horse about back lash his cross slide has about 1/4 inch slop yet he can hold a part to better than a thou , its how you do it Stuart Ps he has 310 video's all show some interesting machining , I am not to enamoured with the use of a file but its his work not mine |
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