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My "Jupiter 1" pencil sharpener has a 45 mm wheel for cutting. However, the cuttings are not very good now after many years in use. So, I am asking you for advice on how to scarp the edge. The scarp

Look at a youtube video "restoration of an antique German pencil sharpener". It may help with the shape of your screws. They may even be able to provide you with some measurements of the screws in

Back 1980's a special tap under ?" to made about $100.00. Dave

Dear Dave, I know this company has been mentioned before, but it may be worth looking at Tracy Tools in the UK www.tracytools.com I hope this is useful. They sell a wide range of odd size taps

The biggest problem was taps for odd sizes. The smaller the harder. A large size I can single point. Try this almost all fire hydrant use LH pipe threads but hose are different sizes The hydrant

Have you looked at Whitworth threads - https://en.wikipedia.org/wiki/British_Standard_Whitworth *From Wikipedia -* *British Standard Whitworth* ( *BSW* ) is an imperial-unit (

Interesting . MY tap set has all 8 of the pitches in Pierre's list below , that set only goes up to 12 mm .? It ca,e to be @ my first motorcycle which is right @ that time frame . I can look at just

It is problem with old things over 120 years before standards on screws. American and UK you can go more. But need American or UK different thread shape. Then two ways to go back to the day built or

It gives you an idea but it may not be totally accurate. I assume these screws thread into your gauge. Do they seem to fit fairly well with not too much play? If so, I would try a screw that should

In addition, if you turn your own screws with an imperial lathe, make sure that you use a 60° tool, NOT 55°, otherwise, especially with small screws, it will easily break.

Metric pitches have changed around 1968 / 1968: Dia old pitch current pitch 3mm 0.6mm 0.50mm 3.5mm 0.7mm 0.6mm 4mm 0.75mm

Hi Dave. I’m in the UK. I left school with an engineering qualification, then it was imperial measurement. I gained an indentured apprenticeship as a precision toolmaker, with a European company,

Paul M: I did what you told me. I found a gauge plastic plate from LMS, not used for many years, and tested many screws. All fit in same line : N.F TPI. So the 2 missing screws have to be there. So

? After reading that I'm a Pirates fan, & not the ball team ??? animal

Try working in inch and fraction then metric too. That what a machinist has to do they use digital inch and convert the rest. Dave

Are there any screws that you could remove and see if they fit the places that have missing screws? You could also measure any screws that can be removed to get an idea if it comes close to anything

I blame the pirates. https://www.military.com/history/why-pirates-might-be-reason-united-states-doesnt-use-metric-system.html

Hi Charles. Nothing in life is 100% accurate. Tolerances, limits and fits appear everywhere – see my opening sentence. He is repairing an old pencil sharpener, not a micrometer, although even many

Littlemachineshop has an online gear calculator that will let you produce any thread desired and with any lathe: you plug in the pitch of the leadscrew and the gears you have available. But it's not

I was born, raised and retired in a metric country. For me, I can't imagine how to work with those ugly fractions. With other words, what you are used to, is user friendly. I expect, if the USA is a