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31st May 2012, 05:33 PM #1GOLD MEMBER
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Knurled Screws for Graduated Dials
This was this afternoons job.
A fiddly piece of work in machining up a couple of small Knurled Screws to replace the slotted grub screws that come as standard with the Hercus Lathe.
For 20 yrs I have had to pick up a screwdriver as a job in the lathe progresses, to zero the graduated collars on the cross slide & compound slide. A slow & tedious method using a screwdriver.
Not any more
Turned up the 3/16th"x 24 tpi & screwcut in the lathe using a recently purchased Thread Micrometer for measurement off a Tap I used as a standard. This thread micrometer is very handy when screwcutting with a single point tool in the lathe.
It takes the guess work out of the job as the thread approaches full depth.
The heads of the screws were knurled using the Scissor type knurl.
regards
Bruce
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31st May 2012 05:33 PM # ADSGoogle Adsense Advertisement
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31st May 2012, 05:41 PM #2
Very neat.
Simple but effective modification that I might just follow.
How did you screw cut without a run out groove at the end of the thread?
Thank you for sharing.
cheers
David
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31st May 2012, 06:28 PM #3GOLD MEMBER
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Screwcutting in the lathe
David
Its very easy. Probably takes a bit of practice.
I have the lathe in backgear so the workpiece is revolving slowly, & the traverse rate of the toolbit is slow.
With the left hand operating the cross slide handle & the right hand on the leadscrew engaging lever on the lathe apron, its simple a swift movement of both at the same time, wind out toolbit & disengage leadscrew.
When cutting these small dia screws I use a head magnifier, to keep a close watch of the tool position as the cut approaches the end.
It does require a bit of concentration & having "your tongue in the right place" but practice is the key point.
Its got that way for me, that in most cases I would rather screwcut the job in the lathe than use a button die. The screwcut job gives better results, with better fitting threads.
Hope this is of assistance.
regards
Bruce
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31st May 2012, 06:46 PM #4
Thanks Bruce,
I sense a really large heap of practice has got you there. Something for me to aspire to!
At this stage I can count the number of such threads I have cut so I am still in the early phase of this game. Even so there is immense satisfaction
(My better half has had to humour me by admiring a 3 point linkage pin with a 7/8 UNF thread cut on it and a nut bought a week later, actually going together with the right clearance.)Last edited by HavinaGo; 1st June 2012 at 10:40 AM. Reason: 7/8 rather than 5/8 after checking
cheers
David
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A society grows great when old men plant trees whose shade they’ll never sit in. (Greek proverb)
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31st May 2012, 06:52 PM #5GOLD MEMBER
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Satisfaction in Screwcutting
David
It is very satisfying screwcutting threads in the lathe.
Practice is good & helps a lot.
Just mount up some free cutting mild steel & start cutting
regards
Bruce
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31st May 2012, 07:08 PM #6GOLD MEMBER
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An excellent mod Bruce. Now make a few dozen more! I'll take 2.
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31st May 2012, 09:20 PM #7GOLD MEMBER
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Threaded pieces for Hercus Lathe
Jack620
No problems, just send me a PM with your address & I will mail you 2 no charge, Gratis
I forgot to mention to 'Havinago" that I did stuff up a couple today, things do go wrong, but with practice it gets better.
I will make some more in the morning.
All the best.
regards
Bruce
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31st May 2012, 09:43 PM #8GOLD MEMBER
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Hi Bruce,
Very kind offer but I'll happily pay you for them. I'm sure plenty of other Hercus owners would too. I'll PM you to discuss.
Chris
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31st May 2012, 09:50 PM #9GOLD MEMBER
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oops wrong place
Last edited by jack620; 31st May 2012 at 09:52 PM. Reason: meant to send PM
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31st May 2012, 10:46 PM #10.
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31st May 2012, 10:50 PM #11GOLD MEMBER
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31st May 2012, 10:54 PM #12.
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20 years. That's impressive Bruce. If you want I can post you over a length of brass rod so when you get around to knurling up your mill dials, you can incorporate a little brass insert in the screw end.
What diameter are the bores and what is the thickness of the wheels in your knurler? If you let me know I may have something that will fit.
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31st May 2012, 10:56 PM #13.
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31st May 2012, 11:07 PM #14GOLD MEMBER
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Brass Inserts
Bob
Thanks for the reminder about the brass inserts.
I noticed the compound slide of the lathe had one in it. I will check the cross slide & if need be make some up for the lathe & the mill.
I have some varying dia brass & easy to part some off.
In the morning will check & advise on the H & F scissor knurl dimensions.
Too cold at the moment, got the log fire burning.
Got a good load of wood in yesterday, ready for more hand splitting, for winter.
regards
Bruce
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1st June 2012, 08:46 AM #15SENIOR MEMBER
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Hi Bruce,
so, not only are we as one in imperial, but screwcutting as well
My apprentice master hated runout grooves unless the situation required so insisted on tool withdrawal as the preferred method. It does take some practise but once mastered looks great. Like you I prefer to screwcut rather than use a button die and it is only recently I have started using the angular approach. Normally I would plunge cut until about half the thread depth then use slight top slide movements coupled with gradual depth cuts on the compound until I reached full depth. After a while you get to know when you are close to the finished thread. I love the idea of being able to put any thread I like on any diameter I like.
Phil
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