Making A Form Tool For Use On The Lathe

Taken from "Making a Watchmaker's Faceplate for the Sherline Lathe - Part 1" - • Watchmaking - Making a...
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[@matthewsykes4814]

Just got in from work and find another awesome video from your good self waiting. Today is a very good day indeed.

[@David-hm9ic]

Thanks! Just wish I had watched it BEFORE I ground a piece of 1/2" HSS tool bit to make a form tool for 1/2" Fillister heads. They came out just fine but your method is way easier.
For anyone using form tools: Use LOTS of a sticky cutting fluid like Rapid Tap.

[@harmlesscreationsofthegree1248]

Beautiful! Your work is always so clean and precise 👌🏽

[@boblow2186]

Nice work.

[@JoseSilveira-newhandleforYT]

A pleasure to watch, as always :-)

[@TheDistur]

Neato

[@jeffarmstrong1308]

For those of you who cannot be bothered to view the whole video -
The use of the hammer at 0:45 is NOT (as it seems from the video) to locate the holes for the tap but to release the CA glue used to hold the two parts together to locate the holes while drilling.
A good trick that I will be using today as I make the Mk3 version of a particularly tricky part.

[@peetiegonzalez1845]

I can't believe I was also briefly confused by that.

[@g1mpster]

Nobody:

[@joevostoch8768]

I love the smell of Hoppies gun oil!

[@g1mpster]

There’s no “i”. It’s just “Hoppe’s”. 😉

[@Chr.U.Cas1622]

I love the smell of Ballistol gun oil (all natural ingredients and for multi purpose use too).

[@ChristopherHallett]

Nothing compared to Trefolex.

[@chloehennessey6813]

My uncle overheard the video playing and asked why I’m watching 70s prn.
😂🤣

[@jeremyronson9140]

Hey Chris, wow, that is an ooooooold price sticker on that square rod! Would it be safe to assume that it is from the time before Chinesium arrived en masse to Australian shores?

[@ChristopherHallett]

Please, TRY to tone down the racism just a little bit, yeah?

[@Bartosh.S]

@@ChristopherHallett What racism ? He pointed out that a low-quality metal called 'Chinesium' is being used too often in the production of tools.

[@giordanobruno1333]

How does it cut?

[@Chr.U.Cas1622]

👍👌👏

[@michaeljansenvanvuuren1517]

Great as always. Do you temper ontop of brass shavings for a reason? Does the shavings hold the heat better?

[@David-hm9ic]

Hope Chris doesn't mind me answering this. The brass shavings slow down the heat transfer and makes it more even which causes the color change of the tool to be more visible and more controllable. Annealing or drawing is very difficult if the heat is applied too quickly.

[@michaeljansenvanvuuren1517]

@@David-hm9ic thank you for giving me an informative answer. I appreciate it. Michael

[@askquestionstrythings]

So how large of a form tool can be made? can you make a form tool that would do the whole profile geometry of a 4 inch (102mm) part? or would the cutting forces get too large at some point for the tool/part/lathe???

[@ChristopherHallett]

That depends entirely on the machinery you're using. Considering Chris tends toward the smaller machines like his Sherline watchmaker's lathe, I would say a 4 inch cutting edge would be WAY outside his scope of operations.

[@askquestionstrythings]

@@ChristopherHallett I've got a "new to me" 2hp belt drive lathe now. We covered the concept of forming tools in my education but I haven't seen anything that discusses size/complexity limits or how to calculate feeds and speeds for forming tools.

[@fn3048]

A machinist INCAPABLE of making something look bad (let alone function and accuracy)

[@larrybud]

What kind of steel is used for this tool?

[@askquestionstrythings]

Generally, these are made out of High speed steel (HSS)

[@MidEngineering]

"Guage plate" or "ground flat stock" - O1 grade tool steel.

[@Jim-he4km]

:)