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Member postings for Old Fart UK

Here is a list of all the postings Old Fart UK has made in our forums. Click on a thread name to jump to the thread.

Thread: Fine cuts on Brass
27/09/2011 17:56:18
Ah you mean this part?
 



Its usually made of three pieces, pressed together, how did you press the boss on tight ?

I wouldnt have thought these were worth making, theres millions in circulation still.

Edited By Old Fart UK on 27/09/2011 17:56:54

26/09/2011 20:38:15
AHHHHHH so thats what this is.
 
i got a box of interesting junk at an auction, all sorts of stuff - blank tool bits, chucks, arbours, dead centres, all sorts, and this:


 
 
This is about 3/4" x 3/4" x 6" long. Its very very fine whetstone - it must be a Water of Ayre stone.
 
Presumably you lube it with water? Wont using it on brass knacker it ?

Edited By Old Fart UK on 26/09/2011 20:41:27

26/09/2011 09:34:26
im turning reproduction meccano parts, so even if i were to make separate tools, there wouldnt be much difference, you still only need a very small tip.
 
Ive honed it with a whetstone, but ill try a diamond lap next.
25/09/2011 20:57:06
I dont know if its a chinese one - how do you tell?
 
HSS 8mm tool steel, ground on a fine grey grindstone, then polished nominally with a whetstone to get a fine edge. I turn these small parts with a bit only 1 mm wide (because then I can use it as a parting tool as well), and i turn with the lathe flat out - 2500 RPM

I cant detect any play in the cross slide, the carriage is fairly stiff and tight.
 
This one is pretty close, the tailstock on mine is slightly different
 
 
The speed control box on mine looks like the above, but the tailstock looks like this on below
 

 
 


Edited By Old Fart UK on 25/09/2011 21:04:14

23/09/2011 22:23:06
In using 5 degrees negative back rake on the top of the tip and 5 degrees end relief on the tool nose, and the tip is set exactly dead centre.
 
ive been honing on a whetstone, ill try a diamond lap
 
I dont get long swarf spirals, just a fine cloud of tiny chippings

Edited By Old Fart UK on 23/09/2011 22:25:39

22/09/2011 17:21:33
Hi
 
Finding myself unemployed for the first time in 42 years, ive bought a 7 x 12 minilathe to amuse myself with (I mean, whos going to give a 57 year old IT engineer whos had bowel cancer and a heart attack a job, dream on).
 
Ive started making reproduction meccano brass parts, plus a few parts meccano never made but should have done.
 
The problem I have is how to achieve a really fine polished cut. Im using HSS 8mm tool steel, ground on a fine grey grindstone, then polished nominally with a whetstone to get a fine edge. I turn these small parts with a bit only 1 mm wide (because then I can use it as a parting tool as well), and i turn with the lathe flat out - 2500 RPM
 
The finish cut isnt bad, but its not as good as just polishing the unworked drawn bar. How can I get a mirror finish?

Edited By Old Fart UK on 22/09/2011 17:22:49

Thread: Fine finish
12/08/2011 09:09:13
Thanks for the tips. I posted the same problem on the CNC forum and didnt get an answer after 4 days. Some forums ae spot on and some are just a waste of hosting disc space.
 
Ill try emery. Id love to know how Meccano did it down Binns Road.
11/08/2011 23:04:31
ah like the thing used to polish stones, they fill with diamond or carborundum dust.
 
Ive come to the conclusion HSS is better than the TC, its just a case of making a tool of the right shape. Ive concluded the cutting edge has to be level with the centreline (zero rake). If i use a tool as wide as the cut i want to make, there will be no sideways ribbing, thats my theory. Ill try polishing the cutting tip on an oilstone as well.

Edited By Old Fart UK on 11/08/2011 23:05:01

11/08/2011 20:33:15
Ive just bought a s/h 7x16 minilathe.
 
Ive got an idea. There several parts Meccano SHOULD have made to make life easier, but never did. One example was a clock escapement. You CAN make one using Meccano parts, but its a pitb and doesnt work very well. If you dont believe me, try getting a Meccano Clock no 1 to run properly. Someone has already spotted this one, and you can now buy laser cut 30 tooth escapement wheels that bolt onto a standard two inch wheel, with a 20 inch pendulum you get one rev per minute.
 
Ive thought of some others, which im not going to reveal to you yet, but im making a few prototypes in order to test the technique of how to make a pile of them with the minimum number of tool actions.
 
One question. A lot of the reproduction brass parts parts have a very nice satin finish with no tool marks, how do you get such a fine finish. Ive tried using a Glanze indexable tool with TC tip and a plain HSS but, but you still get tool marks
 

Edited By Old Fart UK on 11/08/2011 20:34:29

Edited By Old Fart UK on 11/08/2011 20:35:13

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