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Member postings for oldvelo

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

Thread: Vehicle reversing sensors
19/07/2021 22:23:20


The developement of reversing radar as developed by my brother in law in the early seventies because of his concern for the number of horrendous accidents on open pit coal mines in the country

Reversing Radar

A little aside to the topic of it's early beginings

Thread: Scrap aluminium for casting
07/07/2021 23:21:12

Burt Munro on "The Worlds Fastest Indian" fame cast his own pistons from salvaged motor car pistons.

His 1967 record on a very much modified 750cc 1920 Indian Scout stll stands today.




Edited By oldvelo on 07/07/2021 23:22:01

Edited By oldvelo on 07/07/2021 23:22:23

Thread: oil blackening
29/04/2021 22:57:27

Wash clean the parts in petrol or Meths to remove any oil. Work in low light or deep shade.

Heat with LPG torch to dull red and drop into a container used used diesel engine oil, Metal preferably one with a lid.

Keep the torch well away from the gas cloud that forms it is highly flamable.

Be prepared for fire fighting if it catches fire from the hot metal by putting on the lid.

Works well on most steels and cast iron.


Thread: Horizontal Bandsaw Problems - -Advice Please.
13/04/2021 21:22:56

Hi Nigel

Does the spacer-washer on the idler pulley allow it to align with the drive pulley check with a straight edge on the drive pulley.

A thin wire round the pulleys then pulled tight on the half the blade width line the blade runs on the pulleys is the true run line of the blade that allows the blade to be twisted.

The guides must not be deflect the wire out of line from this datum line.

A minor adjustment only is to allow for the wire to blade thickness variation .


08/04/2021 07:03:16


An excellent guide to setting up a bandsaw

Bandsaw Setup


Thread: New car - or is it a wheeled computer?
08/04/2021 01:53:10

Nothing but happy with a computer controlled 2.5 litre car that returns 25 mpg round town driving mostly

Miles 205.6 gallons petrol 25.73 MPG.


Thread: Can Loctite 638 really be this good?
04/04/2021 21:41:46

The tube has the rack for the lever to the piston connected to the side that creates the upwards force load on the flange.

Perhaps if the rack was connected to the underside of the flange that supports the perspex die instead of the side of the cylinder the load on the flange to the cylinder join is greatly reduced and the glued and or swaged join will suffice.


31/03/2021 01:58:12

Looking at the ammount of pitting corrosion on the tube Loctite is not the answer.

Machine the flange with a 45 deg chamfer 2 to 3 mm on the bore.

Carefully Swage the end of the pipe with a ball pein hammer to the chamfer.


Thread: Sending Unpleasant Personal Messages
11/03/2021 19:17:22

Unfortunately a very small minority do not understand that this forums mission is to attack the problems not the person.

Lively debate from opposing point of view make intresting reading.


Thread: Motor control board
08/03/2021 16:32:42


" It also did that hunting business whilst cutting 18mm into steel for about 5 minutes of use before giving up "

The setup of the Current Limit and Intensity Regulator pots are not adjused properly.

KB Controls is an excellent source of information on DC Motors. Scroll to Page 27 for correct setup

Control Board Setup


Thread: SX2P Gas Strut Modification Issue?
04/03/2021 17:31:46

Stop looking for complicated answers to a simple problem 5 months on and the problem not solved.

Time to learn how to learn how to back off the cutter lead angle to 90 deg for machining caste iron, bronzes, and brasses.

Only my biased opinion based on a lifetime of engineering after all it's your time and money.



Edited By oldvelo on 04/03/2021 17:32:19

Edited By oldvelo on 04/03/2021 17:32:33

Thread: Pulley design
18/02/2021 00:42:57

`Hi Martin

Yes washing machines, motor cars, and almost all modern machines use Poly Bee Belts

17/02/2021 19:30:11

Hi Martin

Have you considered using "Poly Vee Belts" for much better performance than "Vee Belts" as an alternative. Much easier to fabricate with the ability to use much smaller driver pulleys. Classic example is Wood working hand held power planers.


P.S. Poly Vee Belt Drive lives at my house

Thread: Coffee machine project
03/02/2021 17:31:15


What a rigmarole to have a machine to make "Instant Coffee".

Add a plumbers nightmare to fix a problem that we never had when we put the dehydrated coffee in cup with and added freshly boiled water not boiling water.


Thread: 3 HP Frisco Standard Stationary Single 4-Stroke IC Engine
30/01/2021 09:13:17

Hi Pat hope this helps

"My problem is that the helical gears at the camshaft-crankshaft junction appear to be the same size, both in photos and on the patent drawings.

So my question is, how do I get a 2:1 gear ratio using cross helical gears that are the same size?"

Roderick's Photo explains it the driver gear on the right has 8 teeth the driven gear on the left has 16 teeth.


Thread: FREE PLAN: A Clutch for the ML7 Lathe
21/01/2021 06:01:44


Oldiron's video is on the right track for a clutch. An Idler wheel on the back of the belt with an over centre eccentric to engage the drive. A peg or an idler on the front of the belt that just clears the belt when the clutch engages.

This will stop the belt from flapping and jerking. This method has been used on various engine and electric driven machines I have built over over a number of years.

Get rid of the linked belt and use Poly Vee Belt and Pulleys or regular Vee Belt in its place.


Thread: The demise of UK fossil fuel Power Stations
19/01/2021 18:19:08


you have just shot yourself in the foot

Fossil Fuels

Can someone explain How 7,000,000 tonnes of wood pellets get to Drax power station and not using fossil fuels. ...

"" They don't at the moment because most ships and land transport systems are diesel""

Do you realy know about what you post.


19/01/2021 09:45:53

Read this article on BBC News a few months ago and found it hard to understand the reason for it.

Fossil Fuels

Can someone explain How 7,000,000 tonnes of wood pellets get to Drax power station and not using fossil fuels. The trees cut down in America and to be pelletised no doubt they used products from the Oil Industry which suprise suprise is a Fossil Fuel. The transport accross America then the Atlantic. Put on rail to Sheffield all Fossil Free?? All paid for by the consumers. All done with No damage to the environment where the trees are harvested from complete with a regeneration program in place maybe???


Thread: I wonder what the Aviation Authority thinks of this :
17/01/2021 16:19:18

Old Iron """Karen""" finds your comment Offensive

Thread: Taper-Lock Bushes - tolerances
29/12/2020 17:18:41

Hi Simon

One method used when assembling 'Taper Lock Bushes' is insert a 'Fox Wedge' or a flat blade screwdriver in the slot of the bush to open up the diameter slightly.

Then fit it into the pulley-flywheel with the retaining screws done up finger tight only to keep it secured the it will slide easily on the lightly greased shaft. NO grease on the tapers or retaining screws.


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