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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: Rust and camphor
29/09/2020 17:15:48

Seems hard to find naphtalene moth balls as the trend now is cedar, any idea where I can find naphalene as this could be useful for me.


Edited By BOB BLACKSHAW on 29/09/2020 17:16:30

Thread: Throw away slot drill
29/09/2020 10:58:42

Hello, I have just recieved a 1.3mm Clarkson slot drill,this will be used on brass only. On the box it states throw away, I understand that its difficult to resharpen a small cutter but I've seen this before on larger slot drills, its HSS I know that I won't throw it away.


Thread: A vacuum engine
27/09/2020 03:32:14

Interesting to see the position of the wick on Johns video, my plan had the wick straight up so a gap from wick to cylinder. I going to dig mine out of the shed in the morning and get it going. I remember I rubbed soft graphite pencil in the cylinder for lubrication.


25/09/2020 09:19:49

I made two of these and got them both working , the problem I found is that it called for cast iron cylinder and piston. With the condensation caused in mine it stopped and when left rust deposits in the cylinder so would not work. I used a stainless steel liner and brass piston and worked for 10 seconds or so.


Thread: Milling cutter advise
24/09/2020 15:02:20

As stated don't bother with the cheap face mills, they look the business but the inserts on mine when fitted are all over the place.


Thread: Best material with bronze
19/09/2020 14:42:12

Hello all, I making a 2/3scale AA RAYMAN marine steam engine and now on the cylinder. I've made the cylinder out of what I think is bronze, it's 50mm wide with a 12mm hole through the large lump that I've got and looks like a casting but with a bronze colour.

What material would be best for the valve that will side on the cylinder face.

Another question I have a large bar of 55mm bronze which is copper coloured which is different from other bronzes it's tough and difficult to drill that it will grab,any idea what this could be, it has the wave heat lines on the bar so know it's some type of bronze.

As with the engine it will not get much use, it's just making it and fitting it in a boat,minimal use.

Thanks Bob

Thread: Classified For Sale
09/09/2020 11:06:33

Out of interest Ron why are you getting a new lathe, the 918 had a lot of improvements done plus the power drive that you fitted. I have a 918 with a inverter and its quite accurate, it's out of interest why the 918 has been sidelined, and what lathe have you just brought if you don't mind me asking.


Thread: Potty:- Helping Dad Grasshopper Engine
28/08/2020 15:49:18

I used a slice of pipe 142mm x13mmx 6.5 mm a lot smaller than 7 inch but looks in proportion.,another option if you fabricate the flywheel .


Thread: D bit help
19/08/2020 16:20:46

Thanks for the advice, I have been using the D bit wrong but luckily my bored holes have come out okay, I have been using it like a boring tool.


19/08/2020 13:32:22

I have started to make a 2/3 scale of A A Rayman high speed marine engine, a call for several small D bits are needed. I have made a few D bits from 10mm to 6mm but wondering if I have been using them correctly, when boring a hole I have the D bit at a slight angle so not parallel to the bored hole so only the cutting edge and not the bar side is touching the hole.

The reason I am asking this is that it is suggested that several D bits from 3/32 to 3/8 at intervals of 1/32 are to be made. Basically my question is this, say a 6mm bored hole, only use a 6mm D bit.

Thanks Bob

Thread: Cigarette Papers
09/08/2020 10:25:14

An ounce of Old Holborn and a packet of green papers, that`s what I remember in the 60s, then going on holiday with me in the back of the sidecar and mum smoking that stuff, and me breathing it in. That put me of ever thinking of smoking for life, but I prefer a smoker than a vaper. A good tip with the green papers noted here as a stick on setting method, I shall get some.


Thread: Addition to wobbler steam engine
27/07/2020 13:39:17

A lot of work involved getting the shape with no joints, well done Dave.


27/07/2020 09:04:42

A good job on your lamp, interested in how you made the lamp cover David.


Edited By BOB BLACKSHAW on 27/07/2020 09:05:55

Thread: 4MM Carbide end mill marks
11/07/2020 14:57:22

Thanks for the advice, my rotary table is a Soba and its new and has no play and it feels tight, I was not climb milling but I done a fine cut .05mm and got the marks out, Perhaps my first cut .3mm caused the cutter to vibrate.

Thanks Bob

10/07/2020 17:50:27

15943992171496885420766624000176.jpgI used a new 4mm carbide end mill on mild steel using a rotary table and the results gave these marks. I used a higher speed as it was a carbide end mill rather than HSS, any ideas why this has happened, also tried a slower speeds but the same happened.


Thread: Pesky Government Announcement!
17/06/2020 16:46:33

I don't listen to the radio, I don't buy a paper,very rarely watch BBC news ,but watch taking pictures,the wife tells me I'm in a time warp.


Thread: Make-shift surface grinding of a threading die face
15/06/2020 02:50:23

That's a good idea Grensands, I suppose silver steel hardened off with two slots for a spanner would work on steel.I to have a number of ME dies with a double lead, I would like to know why they are made like this.


Thread: Drill sharpening?
12/06/2020 10:27:56

Newbies to this its worth knowing that to get a drilled hole to size. Drill several holes to .1mm of size needed 6mm then stone the two cutting points of the drill 6mm and it will be on size, as this acts as a reamer. I have several drills ready done in a separate drill box and works well for me.


11/06/2020 11:58:52

I to have the Picador style sharpener and find it took me a time to get it to grind the correct angles, my faults. I grind my drills by hand and have got very good results so the Picador sharpener is not used, so I recommend you get some old drills and practice and you will soon get good results. I am at a stage where I am making the grinding rest by Harrold Hall, but my grinder at the moment has two adjustable plates bolted on the grinder so I can get different angles to grind up HSS blanks also you can mark with a pen angles on the plates so to get approximate 59 deg for drill sharpening. All this works for me but would like to have a go at sharpening end mills with the advanced grinding rest.


Thread: Another Engine Build
06/06/2020 16:20:18

I'm not taking over Ron`s thread here but noticed mechman`s Gerry`s beam engine on the photos, looks great hope mine comes out as well. That's me finished on this.


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