Search found 625 matches

by Busted Bricks
Thu Apr 25, 2019 5:11 pm
Forum: Off-Topic
Topic: Fine detail
Replies: 6
Views: 210

Re: Fine detail

Some larger test pieces. They haven't been cleaned so do not looks as crisp as they really are.
58441389_10219919864974815_4585418380697141248_n.jpg
by Busted Bricks
Thu Apr 25, 2019 4:42 pm
Forum: Off-Topic
Topic: Fine detail
Replies: 6
Views: 210

Re: Fine detail

ge_rik wrote:
Thu Apr 25, 2019 8:53 am
Impressive! What thickness of ply is it?

Rik
Ermm, it's 1mm stainless steel. (apologies for not saying - I often forget that many people do not know that a fiber laser is for metal cutting :D )

The web in the letters is only 0.25mm wide (1/100" for those with 12 fingers :D )
by Busted Bricks
Mon Apr 22, 2019 5:49 pm
Forum: Off-Topic
Topic: Fine detail
Replies: 6
Views: 210

Fine detail

I've been experimenting with the fiber laser today to see how small details it could produce. The sign in the picture is sitting on an AA cell and it is only 12mm wide. I'm really impressed.
58384295_10219920105660832_7518952228653105152_o.jpg
by Busted Bricks
Sun Apr 21, 2019 6:19 pm
Forum: Locomotives - Alternative Power
Topic: The SOL project
Replies: 30
Views: 1473

Re: The SOL project

The forward voltage of a LED is a lot higher than that of a normal diode so probably not a good idea. You would also need a current limiting resistor in the circuit so you don't fry the LED.
by Busted Bricks
Sun Apr 21, 2019 6:12 pm
Forum: Locomotives - Alternative Power
Topic: Thermo-electric powered tram
Replies: 14
Views: 1085

Re: Thermo-electric powered tram

It looked liked he had found a setup where the peltier element and the cooling fins are at 90 to the hot side. The tubes transfer the heat to the peltier element. It's probably from a CPU cooling setup and convenient for his application as the hot side does not sit directly underneath the cold side....
by Busted Bricks
Sun Apr 21, 2019 12:57 pm
Forum: Locomotives - Alternative Power
Topic: Thermo-electric powered tram
Replies: 14
Views: 1085

Re: Thermo-electric powered tram

It's very simple to do. Just requires a peltier element and a heatsink/fan like those used to cool CPU's in desktop PC. You heat one side of the peltier element and cool the other and it produces electricity. Efficiency is low but that's not an issue at this scale. You can even buy elements already ...
by Busted Bricks
Fri Apr 19, 2019 6:28 pm
Forum: Projects
Topic: Another Wild Rose Project
Replies: 161
Views: 6663

Re: Another Wild Rose Project

I have a couple of pairs of these lying around. They are actually very good considering the low price.
https://www.banggood.com/MG81001-E-Port ... rehouse=CN
by Busted Bricks
Thu Apr 18, 2019 6:31 pm
Forum: Projects
Topic: Another Wild Rose Project
Replies: 161
Views: 6663

Re: Another Wild Rose Project

Sorry, I misunderstood - I thought it was centre drills that were hard to obtain. Yes, NC spot drills are probably not easily obtained from model engineering suppliers. We buy them from big trade suppliers. Good thing about them is that they last a very long time, so unless you crash them, the initi...
by Busted Bricks
Thu Apr 18, 2019 2:23 pm
Forum: Projects
Topic: Another Wild Rose Project
Replies: 161
Views: 6663

Re: Another Wild Rose Project

On CNC machines we mostly use NC spot drills which may explain why the traditional centre drills are not as commonly found anymore. That said, they are easily obtainable over here and don't cost much either - about £3.50 excl. VAT. I have a registered business so can buy from all the tool merchants....
by Busted Bricks
Sun Apr 07, 2019 7:21 pm
Forum: Off-Topic
Topic: Disasters, Out-takes, Accidents, Fails etc.
Replies: 21
Views: 769

Re: Disasters, Out-takes, Accidents, Fails etc.

Failure? Hmmm, that would be myself. I have a knack of failing at most things I do.
by Busted Bricks
Sat Mar 30, 2019 11:51 am
Forum: Projects
Topic: Another Wild Rose Project
Replies: 161
Views: 6663

Re: Another Wild Rose Project

A slitting saw is just a saw blade. You need a mandrel to mount it on so it can be chucked in the mill or lathe.
by Busted Bricks
Fri Mar 29, 2019 1:56 pm
Forum: Projects
Topic: Another Wild Rose Project
Replies: 161
Views: 6663

Re: Another Wild Rose Project

Mild steel is dirt cheap when you buy it in bulk. We pay less than a Pound per kg. However in small quantities the cost quickly adds up. I'm fortunate that I can scrounge all the off-cuts I want.
by Busted Bricks
Sat Mar 23, 2019 3:28 pm
Forum: Locomotives - Alternative Power
Topic: The SOL project
Replies: 30
Views: 1473

Re: The SOL project

Best to use a schottky diode as they have less voltage drop. Any normal diode will work though provided the solar cell voltage is high enough.

As Philipy said, don't worry about using a 5V solar panel with a 1.2V cell. Unless very big, the solar cell will not provide enough current to do any harm.
by Busted Bricks
Sat Mar 23, 2019 12:25 pm
Forum: Locomotives - Alternative Power
Topic: The SOL project
Replies: 30
Views: 1473

Re: The SOL project

If I was going the solar power route I would probably build a goods wagon or two with the roof full of solar cells and a couple or more large NiMH cells inside. That way you could connect it to any electric loco via a couple of wires. It will be a challenge to have continuous solar powered running u...
by Busted Bricks
Sat Mar 23, 2019 11:47 am
Forum: Locomotives - Alternative Power
Topic: The SOL project
Replies: 30
Views: 1473

Re: The SOL project

It doesn't look like there is any charging circuit in that. The solar panel just charges the NiMH cell. The LED driver shuts off the LED when the voltage drops below a certain point. Don't replace the LED with the motor - the chip has some current limiting function. You should run the motor straight...