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Member postings for Roger Best

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

Thread: Workshop temperature - cold
01/12/2020 21:37:34

A warm workshop means less sore joints so mine is insulated better than the house. Neither have central heating, so an electric heater will be used this winter. Last winter there was no machinery installed so no heat was required, yet it kept pretty warm due to heat coming through the wall from the house. I will probably set the thermostat to 18C and lower it as I get used to how warm my smock coat is.

Thread: New jaws for my milling vice.
01/12/2020 21:25:18

How about using a couple of parallels? Should be accurate enough.

Thread: Did i make the right choice buying an old banger Myford lathe.
14/11/2020 11:23:18

smiley

Hi Steve, great thread.

It looks like you would have a good selection of lathes from Warco, Chester and them guys in Leicester for your 2 grand.

My two-peneth is that old lathes should be viewed as old cars, they have issues with spares and wear that can affect their usability, but if you consider that as part of your hobby it can be more enjoyable than a new machine that just does the job.

I follow a few Facebook site and the drummondlathe@groups.io and the hard-core restorers would laugh at you for paying so much, but then they spend a few hundred hours making their latest wreck good.

Bottom line is that your original post shows your are happy with your compromise and that is what matters.

Thread: Power feeds for Chinese mills
10/11/2020 20:44:36

yes

10/11/2020 20:17:39

The simple answer is change the spindle speed, so that the cut is of appropriate size.

Modern electronic controls have 25:1 speed adjustment, its not difficult.

How many speeds do you use Jason, which are the most useful?

10/11/2020 19:58:34
Posted by Martin Connelly on 10/11/2020 18:56:43:

Clearly Roger you haven't been paying attention to any threads regarding feed rates to suit the tool in use if you think one speed fits all.

Martin C

None whatsoever, I am only worried about surface speed, which is determined by the spindle, and gives surface finish along the grooves, and the pitch of the surface finish across the grooves, within the power limits of the machine obviously. I am not worried about reducing machining time by a few minutes, but that is just my, simple world view. smiley

What we are discussing is the requirements and specification for any drive, which informs the decision to make or buy.

How important is total flexibility? If traverse rate is so important why don't drives for manual mills have speedometers?dont know

10/11/2020 17:42:36
Posted by ChrisB on 10/11/2020 06:48:42:
Posted by Roger Best on 09/11/2020 20:46:08:

That's great George.

I have wondered why people keep jumping to steppers and fancy tech. Those of us with model railways probably prefer a simpler way forward.

What's the fancy tech in a stepper motor power feed? It's ok if you prefer to recycle a wiper motor and adapt it to yours, but there's nothong to wonder about people using alternate more up to date methods...each to their own I suppose?

Obviously Chris you are right about steppers being controllable and readily available, and easy for those who understand the drivers.

I will admit to an unpleasant formative experience building a 5-axis CNC that blew up the drivers every time I made a goof in the programming, they where less sophisticated in those days.

My interest in wiper motors is firstly that I have one in the loft and secondly that I feel we only need two or three speeds for most use; fast traverse, stock removal and finish milling/flycutting. The other parameter, spindle speed, is usually readily and accurately adjustable to fit the application. So a simple drive does the job.

What do people think?

10/11/2020 17:14:46

Awesome write-up Alan. yes

09/11/2020 20:46:08

That's great George.

I have wondered why people keep jumping to steppers and fancy tech. Those of us with model railways probably prefer a simpler way forward.

Dave Sawdon - the 18B is a new "hot" model - how about a review? wink

Thread: Good YouTube videos
21/10/2020 20:35:58

I am enjoying Blondihacks a lot at the moment. Plenty of goofs and ways to get out of it.

Ade's Workshop is gentle stuff, he seems to like doing things his way which can be refreshing.

Keith Appleton is also enjoyable and relaxing from a chat point of view, He likes the easy way to do a job, which I can't complain about.

Joe Pie seems a little formal, I think I may have been spoiled a bit by the above crew.

Thread: Mini metro turns 40
21/10/2020 19:55:22

Metros where OK

I learnt to drive in one, my instructor had a mini first, then upgraded to the new Metro. It had appreciably more space and a bit more comfort. Neither had enough power or gears and they where noisy, but all small cars where heavily compromised in those days.

The 80s where a time of great development in cars, we don't remember how fast cars where improving because we have become used to the amazing things we have now.

Thread: Big Bang : Tallboy bomb
14/10/2020 17:45:00

All good stuff, I love a bit of Dambuster history.

there is some Grand-slam stuff on Wiki too:

**LINK**

Thread: Zoom trick
11/10/2020 14:05:00

That is so tempting. laugh

Thread: Home Automation Technique
11/10/2020 14:02:24

smiley Dave, the incoming air does work against atmospheric pressure, which is in balance, so the outgoing air floats in the in-coming. Its more like moving a counter-weighted lift than moving the load on its own.

Its really a viscous flow problem, not a potential energy one. It would be interesting to know if your answer is anywhere near correct, it could make a good rule of thumb.

Great point Speedy Builder 5. The problem of moisture-laden air entering cold properties is a common one in historic monuments and can cause mould. The solution of drying incoming air (Air conditioning) is getting popular where budgets allow.

11/10/2020 10:43:38

Dave SOD, what has lift got to do with it?

Fresh air will replace the air you pump out.

Thread: High Temperature Air Source Heat Pumps for Domestic Heating
10/10/2020 23:26:52

Found it! or at least a brochure from a potential installer. I can e-mail it if you want.

The Monoblock units are small and cheap so more suitable for our house, LG do split units too.

https://www.lg.com/uk/heating-awhp

Its a fast-moving field so I expect to repeat my investigation.

One of the important things I learnt was that you can't get a grant without a proper energy survey by a qualified engineer. All the salesmen would quote a lot and hope that the survey didn't come up with any problems.

It might be worth both of us getting a consultant to do a survey to lubricate negotiations.

10/10/2020 23:00:07

Hi Steve, no we didn't go forward with the system, we didn't get a warm feeling from the people who contacted us, I got some quotes via a company advertising on Facebook called Greenmatch and I was sure they where high. Its on the cards for next year though, probably with a local company.

My house wasn't designed to have services other than a gas fire and cooker, so it has to have pipes and radiators, I am jealous of those who can use nice, simple, air.

I recall that the LG unit gives a good COP at cold temperatures, when other gasses stop working. I am sure they all have poor COP at high temperatures too, gas boilers simply do a better job.

I don't know where I have the brochure or in what form, memory playing tricks again, it doesn't help that the heating paperwork has been tidied away. I thought they sent me a pdf but its missing.

Thread: 2" Durham and North Yorkshire
09/10/2020 13:52:13

Hi Jon

Another rescue job I see, you are a sucker for anything in need of love.

I am enjoying it so please carry on posting. I like small and manageable engines.

Thread: Home Automation Technique
09/10/2020 13:36:43

All good stuff, especially the comments about dew point.

1/2hp seems far more than you need, work out the capacity needed from changes per hour, 3 or 4 will do, more is for cooking or puddles of groundwater etc.

I have bought one of these for fume extraction, I still need to get it installed pulling through filters so I won't over reccommend it until it proves itself. Its worth noting that the biggest is only 120W. There is a size calculator on the page to the right.

link

Thread: High Temperature Air Source Heat Pumps for Domestic Heating
09/10/2020 12:05:16

Hi Steve

A recent innovation is R32 refrigerant, which is better suited to to our climate and makes the LG system highly attractive. I don't know if the competition are catching up yet.

**LINK**

My Mrs is completely sold on electric heating. I put in a wood burner with back boiler about 12 years ago, always intending to hook up thermal tubes to the bespoke multi-coil boiler, but never got round to that, or to having a gas boiler to warm the house when we were at work. After all those winters messing about with logs and probably getting lung cancer she is ready to rip it all out. I am crying inside after all that work, but our work and health have changed with age, we need a warmer house, and the technology has moved on.

We got a load of quotes last year - most where 14k - obscene! One of the issues was the government green skies subsidy, which doesn't like alternative heat sources, even when they are a no-brainer like solar thermal. So if you want the government to chip in then you will have to play a bit of a game.

I would be very interested in anyone's experiences of Air-source and solar thermal too. The posts above are most appreciated, ta.

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