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Member postings for BOB BLACKSHAW

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

Thread: Protecting mild steel
17/08/2019 10:05:46

I've finished a grasshopper engine and need to rust protect the mild steel parts, I don't want to paint it as I don't get good results with this.

I'm thinking of heating the parts and dipping in oil, or any other suggestions please.


Thread: Making the same mistake
15/08/2019 17:02:58

I always make a cam and make the same mistake, its not so obvious until I've made it, then think it out the realize what I have done wrong.

If I was making a hundred in a factory, not being a turner what a cockup I would of made.

I have a 3.5mm offset, so I off set 3.5mm on the clock on a four jaw chuck, but that only gives me 1.75mm offset on the cam.

Its logical to move 3.5mm and get 3.5mm, but it don't work out like that, sorry if this is a basic post.


Thread: Stirling hot air engine.
09/08/2019 16:36:44

Others on this forum will put you right, but I used Easy - flow flux and silver solder wire from Mac Models,works a treat.


09/08/2019 14:56:56

I tried the compound method when doing my end cap but failed after a few goes.

Best to silver solder the brass to stainless, mine has held with no problems.

A small torch with Map gas, or propane is a must in any workshop.


Thread: Karcher pressure washer
09/08/2019 14:47:37

Thanks for the replies,

I will have a look this weekend and see what's going on.

I was suppressed how cheap they are to buy new, easy to become a throw away society member.


09/08/2019 10:25:51

My Karcher pressure washer which is around 25 years old gave up this week.

The problem is that the motor is working but is not pushing out the pressure, it was working fine on the job I was doing then gave up.

When the motor is pumping it now pushes out slightly more than when on mains water pressure

Is this a simple fix or time to buy a new one, its not had a lot of use over the years still in the original box.

Thanks Bob.

Thread: New Mill - Starter Tooling
27/07/2019 16:32:52

If you check out the thread on the 09/02/2016 SX2 PLUS MILL ,the link by Dennis D, the photos etc is how I done the DRO, and why there is less room for fitting at the back.


27/07/2019 15:11:14

Ron, I will takes some photos this weekend and put them on this post.

As for the rear fitting, at the time I found a problem so I will take a look at this as well.


27/07/2019 12:57:27

I have a 9x20 lathe with the three phase motor, I have not read all the threads so sorry if this has been said.

The leaver for tightening the belt I never use as I have found that it stretches the belt to much and will twist over on its self.

I only use three pulleys and have adjusted the motor so a tight fit on the three wheels.

I have mucked up quite a few belts before I made the adjustment, at around £12.00 each they get expensive.

Since the adjustment I've had the same belt now for around a year.

If you fit a DRO to your mill it will have to fit on the front as the SX2p has no room at the back, the other mill before the SX2p did have room.

If you need a photo of my DRO on the mill let me know.


Edited By BOB BLACKSHAW on 27/07/2019 13:02:52

27/07/2019 10:03:59

I've noticed your workshop is not insulated Ron, your tools will get damp over winter.

My shed has been lined with just reflective bubble, and now three winters with a small blow heater no damp.

The insulation is easy to put up, cheap, and really effective,


Edited By BOB BLACKSHAW on 27/07/2019 10:05:15

Thread: Three jaw indipendent chuck
26/07/2019 19:37:14

The hexagon is the housing of the axle,

But my question why are independent three jaw chucks not available


26/07/2019 18:16:27

I've made a 6 inch flywheel in three parts and its came out well, no wobble. The axel was made from hexagon steel so I had to use the three jaw chuck for this.

My question is that when its on the axel and rotated there is the slight out of true caused by the centring on the three jaw chuck when the axel hole was drilled.

Why are three jaw independent chucks made commonly available, as setting up for true on a four jaw is easy to do.

I made a mistake so I had to take the hexagon out of the chuck which caused the slight out of true on the finished flywheel, but with a independent chuck I could of got it spot on.


Thread: Aircraft radio scanner
14/07/2019 15:44:52

If this is in the wrong topic,sorry.

I went to a local air show the other week and I'm now looking for a radio scanner for around £100.

I'm confused with radio frequency etc, so any advice would be helpful. Looking at a Whistler 1010, any good.

I live on a flight path with aircraft flying overhead at various heights, from a few thousand feet to thirty thousand feet.

Would I pick up a signal from a passing aircraft with a receiver at my price of a hundred pounds.

I've tried to find the answers to this on the internet but I'm confused.

Thanks Bob.


Thread: Stuart Hart Grasshopper engine
17/06/2019 18:23:08

Thanks George, Ive sorted out the problem.


17/06/2019 15:08:51


I'm making the grasshopper engine designed by Stuart Hart, I have been looking for the video on youtube but cant find it, I've seen it so I know its around.

If a link to it can be found I would like to see it as it will solve a problem I have.

Thanks Bob.

Thread: A Very Nice Freebie
11/06/2019 10:43:53

Your so lucky Ron to get a set of slip gauges, mine are imperial from 1964 and I use them all the time.

I cant seem to get anything today, a local firm on the internet on the web site stated that any material for hobby use will be willing to sell offcuts. I sent a email, and received one back asking what I was looking for, my reply was just any scrap that was going really, willing to pay. I sent a few photos of what I've made, so a idea what I need, and guess what, not a reply back, I even sent another reminder e-mail the next week. What did I do wrong?

Thread: Small air compressor sufficient to run a Potty Mill
01/06/2019 11:04:31

I have made two potty mll engines and have had both running together on a nebuliser. I have found that the nebuliser has the pressure to run the engines at a gentle speed.


Thread: Bedford Festival Of Motoring
31/05/2019 11:29:59

Bedford at the embankment are holding a car festival tomorrow and Sunday, weather looks good should be over 300 classic cars.

I have a MGB roadster Mk1, looking forward to the event


Thread: Grasshopper Engine part problem
31/05/2019 11:16:53

Hello all,

Ive sorted the problem, its a 3mm stud needed in the axel, obvious really.


30/05/2019 11:06:52


I'm making Stewart Harts Grasshopper engine and have come up with a problem with the eccentric parts 54, 53, 52.

What I don't understand is part 53, with the part rad 6.5mm x 5 mm, is there a part that it fits into. If it does then I'm missing a part on the set of drawings.

If it doesn't then I don't understand how it works.

Thanks Bob

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