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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: Ring rollers - anything known?
21/08/2020 22:53:04

The minimum diameter will depend on the material you wish to bend. Working in a jobbing shop we rolled everything from Armour Plate a total pig to anything less than 5 times the roll diameter to soft brass that was 1.25 the roll diameter was quite easy to achieve.

For up to 8 mm round stock you can use the spring makers method and wrap the on a mandrel in the lathe with snubber block in the toolpost.

Eric

Thread: Twerps with hats on back to front and no front number plates
18/08/2020 00:12:09

Saw a while back a photo of a whole lot of cap on back to front brigade at a motor race meeting in late afternoon sunshine holding up a hand to shade their eyes. Explains a lot.

Eric

Thread: Hot bearing?
15/08/2020 00:54:20

Hi John

With My very limited knowledge is thatThe Myford Speed 10 has taper roller bearings.

Is the preload on the Taper Roller Bearings set correctly.

On a used machine with overheated bearings is most probably over greasing.

A quick dismantle of the of the rear bearing with the inner race removed, cleaned, inspected the inner race for any damage. Reassemble with fresh grease not more than 1/4 of the total bearing housing.

Reset the bearing preload after running and allowed to cool down to room temprature.

Afterthought edit! When a new bearing is fitted they will often run hot when run at high speed until they are "run in" 

Eric

Edited By oldvelo on 15/08/2020 00:59:38

Thread: World's Biggest Tractor in 1915 -- Aussie ingenuity at its best
26/07/2020 23:29:47

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

Thread: Yet Another Mystery Object
24/07/2020 18:53:23

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

Thread: Shellac questions
23/07/2020 01:57:44

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

Thread: Is a drip feed coolant advisable
22/07/2020 01:59:13

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

Thread: Message from the prime minister
20/07/2020 22:02:06
Posted by Baz on 20/07/2020 21:06:35:

OK I give up, what is the significance of Ian Johnson1 bottle of Loctite 271 photo.

Neil Wyatt keeps one handy at all times

Thread: Zyto Owners Only. Other Riff Raff can keep out :P
17/07/2020 18:54:26

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

Thread: Mini Lathe Gib strip question
16/07/2020 18:25:32

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

Thread: Zyto Owners Only. Other Riff Raff can keep out :P
16/07/2020 18:14:46

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

Thread: Poly-Vee Belts
15/07/2020 23:22:31

Hi Chris

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

Eric

Thread: Zyto Owners Only. Other Riff Raff can keep out :P
15/07/2020 23:10:13

Hi Paul

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

dscf0984.jpg

dscf0986.jpg

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

Eric

Thread: Cigarette Papers
15/07/2020 04:04:48

.

 

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

15/07/2020 04:01:54

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

Thread: RJH Linisher Drive Belt
15/07/2020 03:37:42

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

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

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