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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: Motor reduction speed
28/06/2020 22:52:20

Hi

Poly Vee Belts with a countershaft is probably a good option with 4 ribs on the primary drive and 6 ribs on the secondary drive.

As Howard points out the small diameter need as big as possible contact area this can be done with a flat idler pulley running on the back of the belt to increase the wrap around.dscf2355.jpg

Proper Alignment and correct tension is critical on Poly Vee Belt Drives as any error in alignment they will climb over the grooves as the ribs are quite flexible rubber and unable to keep the belt on the pulleys.

Eric

Thread: Pulley Sizes For An X2 Clone Conversion
25/06/2020 21:15:08

Hi

"Is there any reason to try to extend the speed range beyond the standard?"

The 2600 RPM is adequate Only if you use Cutters over 3 mm. You will need to consider a bigger and more powerful motor if you want to increase the spindle RPM. Angular contact bearings on the spindle to handle the higher speed is well worth the expense.

dscf9606.jpg

If you are to fit Poly Vee Belt Drive it is just possible to to fit a 3 speed drive to increase torque to the spindle at low speed and a higher speed for small cutters and all round increased in performance over the Gear Driven Spindle.

Eric

25/06/2020 04:29:34

Hi

You may find this useful this method to fabricate Poly Vee pulleys. "J'Section = 2.34 mm.

Number of ribs + 2 6 X 2.34 = 14.04 mm. The outer flange can be a larger than the diameter by 2 mm to 4 mm than the tops of the finished Vees to provide a guide for the belt.

Eric

23/06/2020 21:51:20

Hi William

"does the spur on top of the spindle pulley drive a powered feed?" No it is a slotted disc used to generate a pulsed signal to an ABS Brakes Sensor off off a Volvo to the Rev Counter off a Diesel Engine with a 96 tooth camshaft gear.

Eric

22/06/2020 22:28:05

Hi

After buying an X2 Mill drill over 10 years ago with 2 speed plastic gears and spring assist on the cutting head. Rebuilt it with Taper roller bearings spindle. Fabricate and fitted Two Speed poly vee belt drive four ribs "J' section. Sold off the motor and controller and replaced with a 1.25 hp DC motor with a AC to DC variable speed Minarik Regenerative Quadrant 4 Drive Controller. Ditched the spring assist for an air spring mounted inside the column with adjustable yoke assembly to get maximum travel of the spindle. Now it is hard to recognise as an X 2 mill both in looks and performance. It is not pretty but is practical.

z-axis 15.jpg

Thread: POWER SAW PROBLEM
15/06/2020 02:09:01

Hi Bob

Try this link Band Saw Tracking

Cover most common errors of tracking

Eric

Thread: R8 or morse taper 3?
13/06/2020 16:12:09

Jeremy Never be put off asking questions on this forum they are all fine just sometimes the answers are the silly part.

John Haine has summed it nicely. R 8 tooling for your mill with MT 3 Spindle it does not apply.

11/06/2020 23:42:10

Hi Jeremy

Morse Taper Tooling is what you have. The drawbar on morse tapers needs to hold the tool from falling out. Tighten with the correct size spanner. In the distant past my old mentors advice was put your thumb on the jaw of the spanner and tighten with your pinky and a little light assistance with the ring finger.

One trap with morse tapers is to insert the Cold tool into a spindle that is running Hot then winching it up tight with the drawbar. Very difficult to remove this shrink fitted tool holder.

Eric

Thread: Enots semi automatic lubricator
10/06/2020 02:30:53

Hi Vernon

Having had a bit a think about this Oiler with the pump washer facing upwards there may be one way valve in the discharge to the oil drip feed piping as well as the oil control valve.

When the top of the top up the pump chamber is filled with oil. Pushing down the plunger will create negative pressure and pull the oil past the pump washer being by restricted-throttled or blocked by the one way valve.

The spring will maintain the oil supply until it reaches the top of it's stroke.

Hope this Helps

Eric

09/06/2020 02:53:55

Hi Vernon

One of my varied intrests is old motor bikes. Dug this out on the interweb Enots Oil Pump

Hope this is use

Eric

Thread: garden tractor wheel lug nuts and studs
09/06/2020 02:34:56

Hi Ajax

I had problems too with accessing my albums Etc. The advice I recieved was to use the Icon No 6 on the second row of the posting window or as it advises Ctrl + K keys together.

Great interesting project looking forward to seeing it running.

Eric

Thread: Bird (feathered variety) expert(s) wanted.
30/05/2020 22:24:19

Hi

Last summer New Zealand we had Two hatchings of a Blackbirds family in a Hoya that grows on our front porch.

Both male and female feed the nestlings as long as it is daylight.

j-blackbirds.jpgo-bb-2.jpg

Thread: [Project 5] Low Profile Table Clamps
26/05/2020 08:55:45

Hi

Fly cutter with the tool stuck out flailing a large radius on a small width workpiece NBG on a gear drive train.

Keep the diameter of the cutting circle just a fraction wider than the job when flycutting to minimize the torque load on a chattering gear chain. Belt drive is infinitely smoother running on intermittent cutting

Three toolbits mounted on 52 mm cutting head will cut faster with one bit starting the cut and the previous one exits.

dscf0426.jpg

dscf0428.jpg

Setting up is a breeze take out the clamp bolt and fix the setup jig in its place to get all the tips equal by installing the toolbits to sit on the jig and do up the clamp screws.

Sharpen dull HSS tips with an oilstone for longer life and almost mirror finish.

Thread: Anyone made Myfordboy's powered hacksaw?
25/05/2020 01:55:07

Hi

This hacksaw has been in use for over ten years now with no problems. Hand hacksaw blades 18 TPI @ 50 to 95 strokes per minute with a rocking and oscillating cutting action that means that only a few teeth at a time in contact with the work.

Wobbly Hacksaw

Eric

Edited By oldvelo on 25/05/2020 01:57:02

Thread: Mount St. Helens
20/05/2020 22:18:18
Posted by Ady1 on 20/05/2020 14:05:37:
Posted by Neil Wyatt on 20/05/2020 12:15:26:

I remember seeing moving footage by a journalist who walked to safety through a literal hell of hot ash. He was convinced he wouldn't make it but kept going.

I can't find the footage.

Neil

The one I remember was some final pictures from someone who didn't make it as the ash flow approached at speed

David Johnston Lost his life in the pyroplastic gas flow his recording obviously survived.

St Helens Erruption Video

More in this link

Robert Landsburg

Eric

Edited By oldvelo on 20/05/2020 22:21:23

Thread: Cross slide dial calibrations - opinions sought.
16/05/2020 05:15:23

Possibly of use to someone reading this thread 2 mm pitch crossfeed screw with vernier scale on the static dial

to read in 0.01 mm increments with the Static Dial on the top.

Rotary dial has 40 divisions. Static dial has 44 divisions. Readings are on the work diameter trom right to left.imgp3352.jpg

Eric

Edited By oldvelo on 16/05/2020 05:18:29

Thread: Sharpening Files
15/05/2020 00:45:25
Posted by John Paton 1 on 14/05/2020 15:57:41:

Interesting stuff re 'sharpening'. Electrolytic with washing soda sounds worth a try as would be handy for controlled de-rusting of car parts too.

De rusting and removing paint or declogging files. The parts need to be connecteted to -- Negative terminal on the DC power supply and the sacrificial Piece to + positive

One of my many hobbies is restoring wood an metal working machinery and have used this technique on my projects successfully. You need to scrub the black oxidised layer from the job under running water. Then remove the water from the job with CRC WD40 etc to prevent immediate rusting if left to air dry.

Eric

 

Edited By oldvelo on 15/05/2020 01:35:37

Thread: "Mystery" Tool
14/05/2020 00:54:01
Posted by ALAN BUTTIGIEG on 13/05/2020 15:10:23:

I believe, someone, somewhere called it a 'spider''......

Physicaly handicapped spidersmiley

Thread: Sharpening Files
13/05/2020 18:02:12

Hi

No need for messy dangerous acid to sharpen files just use two or three table spoons of Washing Soda per gallon of water. The ratio is not critical but an excessive ammount of washing soda will NOT speed up the process.

Suspend the files in the solution hanging verticaly in the centre of a plastic bucket. Two pieces of steel on oposite sides of the bucket wired together.

A DC power supply from a battery charger connect the + positive to the files and -- Negative to the steel plates. Hydrogen gas will be produced by the process so adequate ventilation is required

Depending on the power of the DC supply will determine the time taken to restore the files.

Do NOT be tempted to speed up the process using a DC welder as it cause the solution to boil violently.

NO stainless steel to be used in the solution. Dispose of the solution by chucking it on the lawn it will kill mosses and lichens

Thread: Modern reversing switch
10/05/2020 21:22:26

A Single Phase motor must come to a stop be reverse curent applied or it will accelerate back up to speed and not reverse. Yes I have done it.

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