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Answer; No 4

There are many woods suitable for thread chasing, and those which do not prove immediately suitable can be rendered usable with the aid of cyanoacrylate (ca). I recommend for thread chasing good close grained hardwoods and my three favourites are

Boxwood (Buxus sempervirens),

African Blackwood (Dalbergia melanoxon) and

Mopane (Colophospernum mopane),


however any from the following list, I have used successfully.

Yew (Taxus baccata)

Satine Bloodwood (Brosimum paraense)

Kingwood (Dalbergia caerensis)

Brazilian Tulipwood (Dalbergia frutescens)

Piqia Amarello (Aspidosperma species)

Lignum Vitae (Guaicum officinale)

Red Lancewood (Archidendropsis basaltica)

Cocobolo (Dalbergia retusa)

Santos Rosewood (Macherium scleroxylon)

Leadwood (Combretum imberbe)

Mgrure (Combretum scumannii)

Muhuhu (Brachylaena hutchinsii)

She Oak (Allocosuarina species)

Snakewood (Piratinera (Brosimum) guianensis)

Pink Ivory Wood (Berchemia zeyheri)

Papua New Guinea Ebony (Diospyros ferrea (or insularis))

Mallee Burr (Eucalyptus species)


I now use lots of Alternative materials, which do not produce wood dust, and cut very clean threads.

 Click here to see Alternatives


Answer; No 5

Your problems are not uncommon, especially after having availability of variable speed, and my suggestions are as follows;

Always start your threads at around 450rpm. Make sure your speed readout is correct, as double starts are normally the result of starting threads with a strike that is too fast for the speed of the lathe.

Begin your threads on a chamfer at the front of the spigot by, ideally, using the whole length of the chaser at least for the first two or three strikes. The speed at which you do this is almost certainly, as I have said, the cause of your problems. Most people want to move the chaser too quickly. I suggest around one second for each pass. This should cure your double starts.

Once the thread is begun then, so long as you allow the chaser to chase, it is fine to slow down the lathe to enable better control for short spigots.

Whilst Yew heartwood does work, there is no better wood for threads than Boxwood.


Answer; No 6

Your lumpy ill defined grooves are almost certainly the result of your guilty right hand. Firstly two passes at the same speed and using the whole length of the chaser, that is all the teeth not just a few of them, should have a thread started. Then you must allow the chaser to chase the thread you have started. Even left handed turners still want to push with the right hand. This is nearly always done with increasing frustration and at different speeds, resulting in lumpy ill defined grooves, as you so appositely put it. The right hand is by far the biggest, almost the only, cause of threading problems. Get it under control and the results are what you are aiming at. In order to chase the thread, for females pull back on your armrest with the finger at the end of it, and for males push in towards the centre with your left thumb. This helps to prevent the right hand doing its dirty work.

 As for sharpening, a relatively infrequent occurrence, hollow grind the top surface of the chaser, and the bottom surface of a unichaser.

I hope this helps.

                      

Answer; No 7

I would go for a 6 x 1" B quality loose mop for the abrasive and a WDR quality loose mop 6 x 1" for the carnauba.


http://www.thepolishingshop.co.uk/acatalog/Polishing_Mops.html  


for carnauba wax   http://www.craft-supplies.co.uk/Finishes/Wax/Pure-Carnauba-Wax_FM242.htm


The polish I would go for is Hyfinhttp://www.thepolishingshop.co.uk/acatalog/Polishing_Compounds_800gm_Large_Bar.html

Copyright: John Berkeley. All Rights Reserved  Last updated 21/3/2017


FAQ answers  4-7