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Type: Posts; User: BobL
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18th Apr 2024, 09:18 AM
Thread: Making sense of my welder specs
by BobL- Replies
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- 396
It depends on the design and quality of the...
It depends on the design and quality of the electronics used in the inverter. A decent welder can be closer to 90%.
The inverters used on my ev can achieved and efficiency close to 99%.... -
14th Apr 2024, 09:09 AM
Thread: Making sense of my welder specs
by BobL- Replies
- 15
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- 396
On top of what Michael says, mostbreakers will...
On top of what Michael says, mostbreakers will nominally handle 2X their current rating for a period of somewhere between 50 and 400 s.
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I wondered where you'd gone! FB is all...
I wondered where you'd gone!
FB is all about the "the last five minutes" and being full of so much noise is virtually dead useless as a useful repository of knowledge.
I start Fb sometime... -
5th Apr 2024, 08:54 AM
Thread: Simple adjustable bending jig.
by BobL- Replies
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- 141
Not yet :)
Not yet :)
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4th Apr 2024, 01:54 PM
Thread: Simple adjustable bending jig.
by BobL- Replies
- 2
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- 141
Simple adjustable bending jig.
One of my mates wants to bend some 3 and 4mm rod and a few other cross sections into circles and various other shapes so I offered to make him the following adjustable bending jig.
The 40mm solid... -
30th Mar 2024, 02:05 PM
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I've made "pullers" out of "regular steel" and...
I've made "pullers" out of "regular steel" and "tensile steel all thread" and there is definitely difference between them. It's not as much as you might think but there is a difference. O&B idea of...
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29th Mar 2024, 10:00 AM
Thread: Stainless steel for a work surface
by BobL- Replies
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- 522
Kitchen sinks are usually made out of 304. At...
Kitchen sinks are usually made out of 304. At work we had a couple of chemistry lab benches (the whole bench including legs etc) made out of 316 and their appearance (scratches) seemed to degrade...
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27th Mar 2024, 10:17 AM
Thread: Old stick welding rods
by BobL- Replies
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They will probably benefit from a 20 minute 100º+...
They will probably benefit from a 20 minute 100º+ bake out in an oven. Then store them in a sealed dry container to keep out the moisture.
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27th Mar 2024, 09:49 AM
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An easy/nice way to make a small Al tank is to...
An easy/nice way to make a small Al tank is to use a section of large Al tube.
This is the auxiliary oil tank on one of my chainsaw mills. It's made from 100mm ID x 3 mm thick Al tube and holds... -
22nd Mar 2024, 11:59 AM
Thread: Solar battery install
by BobL- Replies
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According to this...
According to this https://solarbatterysupermarket.com.au/products/copy-of-13-3kwh-alpha-smile5-battery the battery is Li - ion and has a 10 year, 6000 charge/discharge cycle, guarantee
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21st Mar 2024, 07:02 PM
Thread: Old balance recovery.
by BobL- Replies
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- 292
There was no stores branch at work and would have...
There was no stores branch at work and would have had to order them myself. At that stage I had only used the balance once and was not sure if I would use it that much. I use it mainly to weigh...
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21st Mar 2024, 02:21 PM
Thread: Old balance recovery.
by BobL- Replies
- 5
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Old balance recovery.
Just before I retired in 2012 I rescued a 0-10kg (good to 1g), Scientific HD Mettler balance from a skip at work. The balance had a 1966 dated stocktake sticker on it and is built like a brick...
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14th Mar 2024, 08:56 AM
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The bolded comment above really irks me. The...
The bolded comment above really irks me. The whole idea of testing and tagging was introduced because of things like damaged power tools and extension cords as used on worksites etc. I can...
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13th Mar 2024, 10:43 AM
Thread: Citric acid rust removal on tipped tooling.
by BobL- Replies
- 10
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- 614
Just a heads up that lemon juice is anywhere from...
Just a heads up that lemon juice is anywhere from 3 to 8% citric acid and seeing as it'll be tricky to work out what's in any specific juice you're better off using citric acid powder and making up a...
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13th Mar 2024, 08:27 AM
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Before the mens shed I used to attend had a...
Before the mens shed I used to attend had a member who was a licenced sparky I did some electrical/mechanical work on their old machines and would then tag these machines "out of use" until a...
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12th Mar 2024, 06:58 PM
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It's definitely not Kosher.
It's definitely not Kosher.
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12th Mar 2024, 10:37 AM
Thread: Citric acid rust removal on tipped tooling.
by BobL- Replies
- 10
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- 614
Back in 2018 I did an experiment and post on the...
Back in 2018 I did an experiment and post on the solubility of mild steel in acetic, citric and oxalic acids and how well they lasted afterwards without rusting.
For anyone that is interested here... -
7th Mar 2024, 12:20 PM
Thread: My "new" Hercus 9" Model A
by BobL- Replies
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While you're at it I would strongly recommend...
While you're at it I would strongly recommend adding a swarf tray to reduce the amount of swarf that ends up on the floor, shoes, and gets tracked inside your house.
And if you are going to add... -
6th Mar 2024, 08:59 AM
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Some good ideas there, I especially like the...
Some good ideas there, I especially like the flexible one.
I have a bunch of the narrow commercial ones that have a hex shank but the problem I find with using these in a conventional battery... -
27th Feb 2024, 11:08 AM
Thread: How to regulate current on a 12volt circuit
by BobL- Replies
- 42
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- 2,103
Accurately measuring resistances of less than a...
Accurately measuring resistances of less than a couple of ohms is fraught with problems as simple contact resistance can be as much as around 0.5Ω . If it's rated at 12V @50A then the resistance...
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26th Feb 2024, 05:03 PM
Thread: How to regulate current on a 12volt circuit
by BobL- Replies
- 42
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- 2,103
+1 for what JH says. A starter motor would...
+1 for what JH says.
A starter motor would have to be rewound (to much higher resistance) to make it half-suitable. -
25th Feb 2024, 08:44 AM
Thread: Evapo Rust On Wood?
by BobL- Replies
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+1
+1
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1st Feb 2024, 08:54 AM
Thread: Renting, Volantarilly Inspection 2 Weeks In
by BobL- Replies
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You need to clearly spell out in you tenancy...
You need to clearly spell out in you tenancy agreement whether your animals are allowed into the house.
If there's nothing about "animals in house" in the agreement, in your case the landlady can... -
27th Jan 2024, 01:38 PM
Thread: Table rock
by BobL- Replies
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I agree with Steve about floors not being flat ....
I agree with Steve about floors not being flat . All of my tables and benches have adjustable feet to accommodate this.
My mate ran an engineering business making large HD mining gear.
To get... -
27th Jan 2024, 01:24 PM
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Some of those tables are connected to the base by...
Some of those tables are connected to the base by a narrow bit of cheesium which can snap off like a rotten carrot if not handled gently. Even the cast iron ones connected ones cant take a lot of...
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26th Jan 2024, 07:10 PM
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What sort of flap disc did you try? I'd be using...
What sort of flap disc did you try? I'd be using something like the 3M Cubitron wheels, very fast and last longer than Alox flap discs.
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26th Jan 2024, 12:06 PM
Thread: Stainless steel expert
by BobL- Replies
- 4
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- 461
As well as their alloy components, the magnetic...
As well as their alloy components, the magnetic properties of SS (and most steels) also depends on the type of heat treatment and the amount of cold working they have undergone. However, in general...
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19th Jan 2024, 11:16 AM
Thread: Drilling toughened glass
by BobL- Replies
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I've tried doing it a couple of times. My missus...
I've tried doing it a couple of times. My missus had all the diamond tipped gear for drilling, cutting and shaping glass but nope - it shattered every time.
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1st Jan 2024, 09:59 AM
Thread: Cashing in old car batterys, where to go?
by BobL- Replies
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- 1,283
Sims metals in Welshpool will take batteries even...
Sims metals in Welshpool will take batteries even with the acid and they will give you cash in hand in return.
BUT
First time transactors have to produced 100 points of ID and get registered.... -
1st Dec 2023, 08:25 AM
Thread: Unemployed - at last
by BobL- Replies
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After SWMBO died I had a lot of regrets (so many...
After SWMBO died I had a lot of regrets (so many that they felt like they were overwhelming me) but I think I'm slowly getting over (some of) them - note this does not mean "forgetting them". What...
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30th Nov 2023, 10:59 AM
Thread: Unemployed - at last
by BobL- Replies
- 14
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All the best for your retirement. I've been...
All the best for your retirement.
I've been retired now for 10 years and never missed work for a second. While initially I missed the work skips I ended up with so much stuff it started to become... -
24th Nov 2023, 11:21 AM
Thread: Finally started printing
by BobL- Replies
- 8
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Looks good Nigel. I'm curious as to why you...
Looks good Nigel.
I'm curious as to why you say an old version of Cura as the version I'm running (5.4, latest is 5.5) has the Cocoon Modelmaker in the list of supported printers?
One of the... -
23rd Nov 2023, 02:03 PM
Thread: Anologue V digital potentiometer
by BobL- Replies
- 13
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- 1,160
That strongly suggests you have it wired...
That strongly suggests you have it wired incorrectly.
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17th Nov 2023, 08:59 AM
Thread: Anologue V digital potentiometer
by BobL- Replies
- 13
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- 1,160
Nailed it. :D
Nailed it. :D
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14th Oct 2023, 09:10 AM
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There are dozens of reasons to, where possible,...
There are dozens of reasons to, where possible, transit from ICE to other forms of transport energy and here are 3 to think about
1) Despite repeated warnings from health experts exhaust air... -
13th Oct 2023, 10:40 PM
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Bar0n you are somewhat out of date on the...
Bar0n you are somewhat out of date on the relative cost of the Battery in an EV
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2 years ago Tesla started makings its own Batteries for about US$115 /kWHr so a 75kW hour battery costs Tesla... -
13th Oct 2023, 10:21 PM
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Yep, don't know about other EVs but Teslas are...
Yep, don't know about other EVs but Teslas are designed to fall apart on collision which is how they protect the occupants.
Anyway most ICE vehicles today are in the same boat.
In 2010 an idiot... -
13th Oct 2023, 02:48 PM
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Ive seen a few Li battery fires but am more than...
Ive seen a few Li battery fires but am more than happy to drive around sitting on top of a 75kWhr Li Battery.
FWIW Teslas have amongst the lowest rate of accidents of any motor vehicle especially if... -
13th Oct 2023, 12:02 PM
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I agree EVs are not for everyone, but after...
I agree EVs are not for everyone, but after watching 3 of my brothers buy them and going for rides and test drives I drank the kool aid 3 months back, and and now love my EV. Every time I drive past...
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12th Oct 2023, 10:43 AM
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Not MW but demonstrates safety required with compressed gasses
WARNING: The Video Link shows death of a person.
https://youtu.be/RkVSdBUIaXw?si=XlpUo6FPByH4ASJa
Interesting that some of the video comments think this an electric vehicle.
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3rd Oct 2023, 02:12 PM
Thread: 300mm Grinder Refurb
by BobL- Replies
- 19
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- 1,711
Looks similar to a 10" Atkins driver I spruced up...
Looks similar to a 10" Atkins driver I spruced up back in 2015
https://metalworkforums.com/f65/t193863-atkins-grinder
I wasn't using it so I gave it to my Brother who is still using it.
... -
2nd Oct 2023, 04:41 PM
Thread: Suggestions for theif proof gate lock
by BobL- Replies
- 61
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- 3,933
The more noticeable the security features are the...
The more noticeable the security features are the more you're likely to be signalling that there's something worth pinching.
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27th Sep 2023, 09:31 AM
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The better types of knurling tools are those that...
The better types of knurling tools are those that put the least load on the tool post and these are the clamping type knurling tools.
The type that puts the greatest load on the tool post are the... -
11th Sep 2023, 11:56 AM
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I and industrial users will mainly be using epoxy...
I and industrial users will mainly be using epoxy or urethane paints.
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4th Sep 2023, 10:49 AM
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What's the intended use? - 6" long suggests some...
What's the intended use? - 6" long suggests some sort of chisel?
If so, just be aware that at 1/4" in diameter it will be brittle, hence potentially dangerous for use as a chisel. -
31st Aug 2023, 08:50 AM
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Usually its a pale yellow powder so I'd say...
Usually its a pale yellow powder so I'd say there's something else in the Deck Cleaner.
It's possible to paint straight over the top of pure Oxalic acid powder as it binds well to the paint -
30th Aug 2023, 05:01 PM
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Yes 10:1 or 10% by weight usually is enough so...
Yes 10:1 or 10% by weight usually is enough so 100g per litre of water.
Even though it's found in leafy vegetables like rhubarb, it's very mildly toxic so wearing gloves is a good idea. -
29th Aug 2023, 08:47 AM
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If you are painting over the surface, then Oxalic...
If you are painting over the surface, then Oxalic acid is the go and is used in large scale industrial applications since it does not need to be rinsed and the treated unpainted surface remains rust...
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28th Aug 2023, 10:55 PM
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I find soaking works much better than just...
I find soaking works much better than just painting on any rust converter.
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28th Aug 2023, 12:01 PM
Thread: Linishing Belts
by BobL- Replies
- 6
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- 567
The Cubitrons are definitely the best, especially...
The Cubitrons are definitely the best, especially the low grit sizes for shaping, and I'd love to get them in my size (150x2000) but they cost $47 each and you have to buy a pack of two. For general...