By continuing to use this site, you agree to our use of cookies. Find out more

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: 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

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

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Latest Forum Posts
Support Our Partners
rapid Direct
Dreweatts
Eccentric July 5 2018
JD Metals
Warco
emcomachinetools
cowells
walker midge
Eccentric Engineering
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest