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: Holding End Mill on small lathe|
Milling cutters in a lathe or drill chuck will hold much better if the shank of the cutter is inserted as far as possible.
Tighten the chuck using all the three holes plus once more in hole one.
NEVER use a cutter with the diameter of the flutes greater than the shank in a three jaw chuck.
As an old mentor of mine said "Tighten all four holes in a three jaw chuck and five holes in four jaw chuck".
|Thread: Gas Strut|
The most common mount for a gas strut is inside the vertical column of the mill. You will need to fabricate mounting brackets for the strut and drill a hole in the back of the column.
|Thread: cylinder lubricators|
Hi John Working in industry I worked on machines that had a sprag clutch fitted. They come in all sizes with the same dimensions as a Ball Bearing. possibly one of the very small ones would fit the bill. Took a peek at you tube
Not a good idea to make the outer in any old steel it will FAIL even in a short time. The whole thing needs to be made from hardenable steel and properly hardened and tempered. The units I worked on had given thousands of hours service in harsh conditions.
Edited By oldvelo on 23/02/2020 20:40:55
|Thread: WM18 - Broken it again :(|
Re ducting the gap between the top of the motor and the fan is 4mm so think ducting would prob not held and be a bugger to design.
Just an Idea Plywood 10 mm thick say 120 mm x 120 mm bore a hole in the centre to fit over the motor bolt to the underside of the fan.
Looks good make sure that the fan has a duct to the top of the motor to get the full airflow over the motor and not bypass it by just ventilating the cover.
Sounds like good plan with a 120 mm computer fan on the inside of the cover, As Martin points out that running in reverse may be a problem running in reverse,
The computer fan will cope at low speeds. How many times will you be running in reverse at highest speeds if a problem switch off the auxiliary fan.
"Note sure where I would fit it ie above the motor and would it suck out heat or blow in cold air?"
If the fan on the motor air flow comes out of the top Then mount the fan on the top of the fibreglass housing to suck out the hot air. Push old air in if the outlet is at the spindle end of the motor.
Fit a duct to fit over the diameter of the motor to the fibreglass cover to get maximum air flow through the motor.
I fitted an auxiliary fan on the mill years ago the motor never gets hot even at slow speed and a heavy cut with 4 AMPS showing on the meter
|Thread: cylinder lubricators|
Hi John Please post more details as to the end use of the lubricator. I.E. Lubricant amount and viscosity continuous or intermittent delivery Etc.
|Thread: WM18 - Broken it again :(|
So many explanations of what went wrong and why it happened at what needs to be done to fix it.
Prevention is better than cure. Fit a an AMP meter to the DC motor leads in a position where you can see it easily..
Fit auxiliary cooling fan to the motor
Mark the Meter With Maximum Rated Amps of the motor.
Adjust the speed and feed to below the marked amps.
A KB Electronics AC to DC controller set up correctly with the "Locked Rotor Test" to Less than the rated motor AMPS will trip on excessive loading.
Either one will will help I prefer both "Belt and Braces" man myself
Edited By oldvelo on 21/02/2020 18:05:12
|Thread: Bandsaw woes.|
Hi Robin I have a copy on blade tracking for band saws By John Pitkin
I have found this invaluable please add credits if you post the contents on line.
|Thread: Noisy Lathe Gearbox|
Single Phase motors have a tendency to cause chatter in lathe and mill gearboxes and run roughly due to not being synchronized with the 50 cycles per second power supply when they run at 1425 RPM.
Cured mine by Replacing the drive motor with a Variable Speed DC motor and pumped oil supply using a fully synthetic 30 oil . Photos in My albums.
The problem with E.P. oil attacking bronze is when it becomes contaminated with water the reacts with the sulphur additive used for Extreme Pressure loading on gears.
An alternative used in extremely high humidity used on worm gearboxes was 600w steam cylinder oil.
Edited By oldvelo on 08/02/2020 09:52:33
|Thread: Morse Taper Removal|
There are More
|Thread: Strange (to me) chuck jaw design.|
Never had a new fangled chuck key in the 1950's. Old mentor " It's called a chuck key cos if you leave it in the chuck the lathe can chuck it at you".
|Thread: A simple material stand for a power saw|
Good way to use axle stands for a base. A Three Legged Base is always better than a round base. If the load becomes unstable and is all on two legs they will not be on a single point as with a round base that becomes a wheel.
|Thread: V-belt vibration in Ajax AJ8 horizontal milling machine|
"Still no option for fine adjustment of belt tension". It is possible by Inserting "Ü" shape shims around the hold down bolts Between the base and the mill.
|Thread: What to do with a stationary engine|
The engine used clockwise rotation as a standard, but some Anti-clockwise engines were factory produced. The exhaust and inlet is the same on both engines. I used a Lister D on a shearing plant in the 1950's no impulse magneto drive fitted.
Comparing the two creations shown is that the motors rotate in opposite directions. With a single cam on the camshaft. Clockwise or Anti Clockwise driving dog and crank handle available from the factory.
|Thread: What are these pliers for|
I have used a similar pliers to fix chicken wire netting to a wire fence.
|Thread: Model aircraft pilots angry over drone laws|
Well Said Nigel
Sadly intelligent and responsible expert model fliers are being lumped in with cash rich morons that buy into a technology that is completely beyond them.
Putting drones in the hands of drones is now a reality
|Thread: Bandsaw speed|
You will need to slow down the band speed with a counter shaft or gear box. May I suggest you use Poly Vee Belts 6 ribs will be more than adequate for the existing motor. Pulleys are easily fabricated and capable of quite large ratios.
Use an idler pulley on the back of the belt to give the small drive pulleys to give a better contact area.
More can be seen in my album Bandsaw 2.
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