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Member postings for James fortin

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

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Thread: gas tank construction
06/01/2011 21:20:09
i dont know if this will hep but 'pure copper in its cast form has a tensile strength of around 125n/mm2 
though drawing increases this to 275n/mm2
 
from; 'workshop materials by alex weiss'
 
james 
Thread: bandsaws and vices
30/12/2010 21:24:07
hi all i am looking to purchase a bandsaw for my workshop and after searching around the web i have a found a 4x6 bandsaw at a very low price  bandsaws (second one down) but i realise it has a camlock vice. has anyone had experience with these vices or currently use one. any info would be appreciated.
 
also does anyone else use this model of bandsaw as the next model has the same capacity but seems to be more popular, is there something i have overlooked
 
many thanks
 
james 
 
Thread: Broken tap
06/12/2010 17:06:29
i once read that spark erosion was partly discovered in the russian ship yards as they used to weld an extra piece of bar to a broken tap or drill and unscrew it via the welded piece, but they noticed that when they welded it the spark eroded the metal and so EDM was born.
 
you could try zapping a rod to it with a welder? 
 
many thanks
 
james 
 
 
Thread: reversing a milling machine
01/12/2010 17:01:44
oh, thanks for that. now i think of it horse power isn't torque at all its just another unit of power as torque is in ft/lbs and n/m
 
many thanks
 
james 
01/12/2010 16:56:28
thanks for the diagram john, it makes sense now  , i might still use this method if i cant afford a tapping head. but at the moment the the tapping clutch sounds sensible.
 
thank you all for your input 
 
many thanks
 
james 
01/12/2010 16:47:14
thanks ill look this up and buy one of these instead
 
many thanks
 
james 
Thread: Workshop floor
01/12/2010 16:25:30
when i built my workshop we put extra bearers under where the machines went and screwed them in
 
hope this gives an idea
 
many thanks
 
james 

Edited By James fortin on 01/12/2010 16:25:49

Thread: reversing a milling machine
01/12/2010 16:21:20
thanks for the advice - i think i should be able to tap quite things easy as in the lowest gear the reduction is 1450 / 120 . the torque is 12 time more than at the motor(hence 12 times less speed)- thats a total of 12 horsepower 
 
when i am out in the shed next i will try my biggest tap and see how it copes
 
many thanks
 
james 

Edited By James fortin on 01/12/2010 16:23:05

01/12/2010 14:52:20
its not a silly question 
 
i need i reverse it because in the future i am going to us it as a tapping machine and for other things that require reversing 
 
by the way its single phase. 
 
many thanks
 
james 

Edited By James fortin on 01/12/2010 14:58:17

01/12/2010 14:44:20
sorry the formatting has changed maybe this is better
 
 
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Edited By James fortin on 01/12/2010 14:44:42

Edited By James fortin on 01/12/2010 14:45:09

Edited By James fortin on 01/12/2010 14:45:28

Edited By James fortin on 01/12/2010 14:45:43

01/12/2010 14:38:09
 ive put some pictures up and i also found a diagram inside the cover that looks like this but unfortunately couldn't photograph it because it is to small.--- the 1234 are the connections to the 4 poles and the 2 wires going towards them is the supply- i don't fully understand this diagram, any opinion on it is welcome.
 
 clockwise      anti clockwise
  CW                     CCW
 
  1  2  3  4         1  2  3  4    
   I   I   I   I           I   I   I   I    
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     I       I               I       I
 
 
 
many thanks
 
james 
 
01/12/2010 14:17:44
when i got it and rewired the mill it did have 4 connexions. ill post a pic when i get in the shop.
 
many thanks 
01/12/2010 14:05:54
hi thanks for the advise
 
a diagram would be appreciated john-its a 4pole induction motor if this helps
 
 
many thanks james 
 
 
01/12/2010 12:38:37
i am at the start of putting a reversing switch on my mill using a DPDT switch. (so i can reverse taps e.c.t)
 
the diagram goes like this
 
 
 
 
 

am i right in thinking that this should reverse an AC motor or will it still run in the same direction- because i know most motors have capacitors on them but don't know if this affects the direction
 
any help would be appreciated
 
many thanks
james 
Thread: Metric vs Imperial - Practical or Traditional?
01/12/2010 09:30:03
i often use metric as it is easier to work in 10s but find it ironic that after trying to standardise all the witworth threads and then making a new standard of metric thread, engineers still have to use imperial threads for specialised parts or mechanics which require a non standard thread. i prefer to use inches when do ing diy as it is a smaller number i.e. 2540mm or 100inches.
 
 
no doubt a new thread standardisation will be invented in 50 years or so and then the model engineers will be calling metric 'old' and 'traditional'  

Edited By James fortin on 01/12/2010 09:32:39

Thread: Chinese lathes
25/11/2010 17:20:55
if anyone wants to know what lathes and machines sieg makes look at
 
http://siegind.en.alibaba.com/productlist.html
 
it opened my eye to how many lathes they make and other company rebrand. 
Thread: Is this hobby dying?
24/11/2010 15:23:54
i am only 15 and started model engineering because of lack of lego. i was always building lego models but felt i was restricted by the types of parts that were available, but now i can fabricate almost anything providing ive got the right cutter. i hope to carry on with this hobby for as long as i can ,as i find it very interesting and i can made functional tools and products(no more going to the shop to buy a replacement, just knock one up)
 
Thread: Chinese lathes
22/11/2010 22:02:12
unfortunately im not old enough to drive a car nor have the equipment to overhaul one
 
but when i got my machine i striped it down as far as i could and lapped all the gib strips and surfaces, however i did not change the bearings as i do not  have a hydraulic press but i make sure there is no casting sand in them and that every thing runs smoothly and quietly
22/11/2010 20:43:05
i emailed excel machine tools for a price for this machine and they quoted me nearly £3000 if this is almost twice the price of the warco model it must be of better build quality or someones getting a bigger paycheque:-]
22/11/2010 20:14:28
even if i bought a new lathe that said "ready to run". i would still want to strip it and rebuild it just so i can see for my self that everything has been adjusted right and will not wear prematurely.
 
though its probably just paranoia 
<< First < Prev 1 2 3 Next > Last >>
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