Member postings for oldvelo

How this monster ever did any work at all other than downhill where the 45 tons would help it move.

The power to weight ratio on "Big Lizzie" is 1.3 hp per ton. Compared to the Fordson Model F first built 1917 that weighted in at just over 1 ton and rated at 20 hp.

Having the benefit of 20/20 vision in hindsight I offer nothing but respect for Ralph Falkiner.& Frank Bottrill for having an idea. Then have the courage to put into practice with this leviathen machine.

What little knowledge I have of the land that was developed for "Soldiers Settlements" was a government decission to utilise land that they had picked off a map with little or no knowledge of the true nature of the land or conditions in that area.

Eric

This does not happen often both Duncan and Dave are sort of right it depends on the liquid in the tank was it wine or beer. Had to consult Wikipedia for more information.

Ullage

Based on this Dave is a beer drinker and Duncan a wine drinker.

Eric

Hi Chris

Shellac gasket sealant is available from automotive spares stockists. Shellac is soluble in methylated spirits or iso propyl alcohol.

Super Glue to fix  parts and heat to remove it . Acetone is the solvent for Super Glue. Some Nail polish removers that contain Acetone in a high percentage will work. 

Eric

Edited By oldvelo on 23/07/2020 02:03:55

Hi Chris

Here is a link you may find useful for coolant appilication

Drip Feed Coolant

One I have used for several projects is a 2 stroke motorcycle oil injection pump. You can use the throttle cable lever to adjust the flow or drive the pump with variable speed DC motor.

Eric

Neil Wyatt keeps one handy at all times

Hi Perko7

You can adjust a fixed tension on on a belt drive to vary when the belt will slip.

I do this on the mill when tapping threads with a motor that has instant reverse and ramps back up to speed no broken taps for years.

With the wieght of the motor swinging on the tension you have the motor pulling on the belt able to lift up and drop down this will over tension the belt and the motor climbs again is the most likely cause of the oscillations.

A heavy intermittent cut at slow speed will demonstrate this best.

Eric

Hi Keith

The method I used is to clean up the indent with a egg beater hand drill one at a time with the other adjusters tightened up.

Useing a 4 mm bearing ball to locate the end of a 5mm Cup Point Grubscrew < o > explains the layout

Eric

Hi perko7

Well done you asked the question and answered with one posting. A factory with motors all jumping and swinging like hammocks in a storm at sea comes to mind

Eric

Hi Chris

Poly vee belts populate my workshop 4 PJ ribs up to 1hp & 6 PJ ribs on 2.5 sawbench.

Eric

Hi Paul

Belt tension, speed changing, With a countershaft on self aligning bearings

Swinging the weight of the motor to tension the belt is not best practice

Eric

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Edited By oldvelo on 15/07/2020 04:07:29

Legge Millicutter Tobacco Cutting Machines use 4 tobacco papers to set the 4 Thou clearance for the knife clearances. Get it wrong and it can be very expensive.

Also used on milling machines stuck to a very lightly oiled work piece when the cutter rotating very slowly preferably by hand would brush it from the work you had 1 thou clearance.

Eric

Hi James

You may find this calculator useful

Belt Lengths and Ratios

The string method can be used if you measure the OD of the pulleys minus 8 mm for "A" section belt.

Calculate both driver and driven diameters. Add together and divide by 2.

Measure the shaft centres and multiply by 2.

Add the Totals of Half Diameters and the 2 shaft centres will give a close approximate belt length

Eric.

Edited By oldvelo on 15/07/2020 03:42:11

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.

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

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.

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

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

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

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.

Hi Bob

Try this link Band Saw Tracking

Cover most common errors of tracking

Eric

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.