Here is a list of all the postings fizzy has made in our forums. Click on a thread name to jump to the thread.
|Thread: Cast iron welding electrodes|
I strongly advise drilling a hole either end of the crack, seems to help stop it cracking more when you weld it. You didnt say if your rods had been pre-heated, im guessing not, and therein lies your problem. They need to be hot.
|Thread: First foray into 3D printing|
edge of shelf mounted er32 collet holders...starting simples!...to be continued
when i was on the road i had to use a vpn, now i work from home and have good security i dont really need it as i dont remotely access my server.
|Thread: Curve Cut Problem|
Hi. Im using Curve Cut to process a 2d drill sequence. Problem is no matter what inputs I use I cant get away from "will result in more than 20 passes". Its a simple drill, retract move and repeat. Any idea what im doing wrong?
|Thread: Would you buy one of these collets?|
At not more than £10 from most well known UK suppliers why would you?
|Thread: Question from a customer|
The way I thought about it is....if the boiler were just a strong sealed container (which it effectively is) with water in it and heat applied, the water would turn to steam, the pressure would go up. Let it cool down and the pressure comes down to exactly where it was when you started. Nothing can have changed. The only difference when using it for real is that there will be less water in it when it cools down, assuming no more has been added. Ive tested this with a smaller boiler with no clack, running the water level down whilst maintaing 40 psi driving a D10. Closing the steam valve and after cooling there is absolutely no negative pressure that I can detect.
A customer of mine has the set up below, two 5" boilers set up running a Victoria powering a dynamo. He asks: as the boilers cool they suck in water via the clacks - if there were no clacks could they implode? Now we know they dont, and blowing down isnt mandatory so how much negative pressure is there? I have never experienced this but its worth asking you folks.
|Thread: Has to be seen to be believed|
And therin lies my unmentioned dilema. As a professional boiler maker I see how terrible this item is - If put under pressure it will simply distort and eventually fail - it wont explode, its not a bomb and it probably will fail at 15 psi....but its a terrible thing that is being passed off as well made. Do we have a duty of care to point this out or do we say nothing in the hope that nothing bad comes of it?
Seller claims it is well made - what do you think?
|Thread: A (new to me) Tom Senior Major ELT|
Lovely machine....how are you going to move it? looks very heavy!
|Thread: Water in fuel|
Studdied biochem at uni long ago...but....IPA will keep the water in (the fuel) solution and thus minimise corrosive effects. It has bveen used in vehicles up to 40% bv but this can be counter productive to longevity. It is reccommended not to exceed 10% bv in a petrol car. At 10% the RON will roughly increase by 2.5 which is good news for your engine, so its a win win realy. I dont have first hand experience of commercial addatives but its most likely just dressed up IPA...why reinvent the solution?
|Thread: How many Hammers|
got nine...all used regularly depending on job.
|Thread: scratch built beam engine|
Athough not an interferance fit the valve needs to be held close to the port face or air will get under it and it will never seat. Its also possible your timing is out so instead of going to compress the cylinder it is going straight out the exhaust - thick oil is always useful for starting out.
|Thread: Drill running off course|
If I need total accuracy I have found it essential to use a centre drill to start and have the job clamped solid. You need a good centre pop too.
|Thread: Current leakage om CNC|
Ian - it was bought off ebay from China, not a great starting point I know but there are a lot of them used in the UK and apart from me being electrocuted how they make them for the money they charge is anyones guess. Ive now earthed it and it shows varying but very low volts and almost zero amps so its going in the right direction. Nothing tripped and ours is a new house. My mate forced the two pin plug into a uk 3 pin socket - I never even saw it or gave it a thought until you kind lot prompted the questioning so big thanks to one and all.
nope, defo no earth. I will be adding chassis earths and converting to twin and earth 3 pin plug.
Im using the earth of the 240v socket - there is no earth pin of the plug, hence my concern.
Update! I tested the wall socket as advised and all is as should be so I tested the spindle motor - 4 pins, 3 of which were 120v, same as the frame measured. I had a spare motor so swapped it in and ran it up. Now 70v between table and earth. Dissconnect spindle motor and 40v between earth and table. Tested resistance from plug earth to table and no reading at all. I tested wherever I could and got the same no reading. Tested continuity and nothing....now my mate set this up for me so ive never been near the wiring but on investigation I see that the cnc has a TWO pin plug. My question is, woild fitting an earth strap to everything and connecting it into the extension cable (checked that and all good) allow the current to escape or is there a fundemental problem with my machine? Many thanks
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