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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: SX2P Gas Strut Modification Issue?
05/10/2020 00:42:34

Hi

A lot of solutions quoted until you address this the problem will continue

( I’m not using modified tools, they are standard mills, drills or slot drills. I wouldn’t know how to modify them anyway)

Higher rated Air spring will give higher resistance to the cutter being dragged into the softer metals by the cutter edge angle and maintain pressure taking out any backlash.

The cutter can be modified with a Dremel grinder and back off the cutting edge to parallel to the Centre Line.

Eric

04/10/2020 05:16:31

Hi

The gas strut needs enough power to push the head up to the top with with the fine feed disengaged and the lock slackened off.

Fit "Air Spring" to counter weight of mill head 24 kg rated is the one I have fitted to a much modified X2 mill.

z-axis 15.jpg

If the castings you are spot facing is Çast Iron, Bronze, or Brass you need an end mill with the cutting edges backed off to 90deg to prevent the end mill from diving into the castings. The piddly little hand wheel is a pain to use the photo shows the mods done on X2 Mill Drill

Eric

Thread: Cl300m Bearing and Belt Advice
02/10/2020 07:04:24

Hi Woody

The toothed belt runs smoothly when tensioned correctly and should cause no problems.

The gibs on the top slide and crossslide may require some attention to get better performance to the finish.

One mod I have done is to replace the adjuster screws with cup point socket head grub screws and a 4mm ball bearing to look like this " <o> " Lock up the gibs tight then remove one and with a 4mm drill in an eggbeater hand drill tidy up the dimple in the gib strip. Put ball in and tighten up the grub screw then repeat with the next adjuster screw.

Eric

30/09/2020 08:28:05

Hi Woody

General opinion for bearing is to replace with angular contact ball bearings. These are the same dimensions as the original bearings.

The toothed belt on low speed will give positive drive. Vee Belts do not perform well at low speeds and high loads and tend to slip.

An option is to use poly vee belts "J" section 4 ribs or overkill with 6 ribs is adequate for 300 watt motor.

Simple enough to fabricate pulleys from Aluminium or Cast Iron Keep the diameters the same as the original or propotionally bigger that will still fit under the guards.

Poly Vee belts perform quite well at low speed compared to vee belts.

Eric

Thread: Spindle Speed
26/09/2020 00:49:17

Hi

Pete says "Many good lathes fitted with variable speed have also been fitted with a tacho or speed readout." mine is only mediocre and has one fitted. Mill and Drilling machine share at the flick of a switch.

Variable speed power feed is also a good option. An Amp meter fitted to the main motor leads will help keep from overload when using a heavy cut.

Eric

Thread: Chatter
24/09/2020 01:04:05

Xd 351 points out the gap under the toolpost as the most probable cause. High speed steel ground for cast iron needs negative rake and the tip set not lower than centre hieght. Honing a high speed steel insert with an oil stone for better finish on almost all metals.

Eric

Thread: Chester V20 Mill Drive Board Died
17/09/2020 21:51:13

Hi Peter

please make sure that the controller is set up to match the motor. John will be able to help you with this task

Eric

Thread: BSF and Whitworth "Across the flats " sizes.
12/09/2020 22:33:37

One size that defies the use of metric or AF substitute is 5/16 Whit Post war.

Thread: Mini lathe blown fuses and Motor overheating
27/08/2020 20:08:59

Hi Apologies to all for wrong link

amp meter.jpg

Eric

27/08/2020 01:38:11

Hi David

Keep us posted on your lathe motor repairs alway intrested in how thing get fixed.

Eric

26/08/2020 21:21:10

Hi David

Ouch! sound expensive. The use of the low speed recomended with the motor running at higher speed.

One improvement I have posted repeatedly is to fit a DC Ampmeter on the motor leads.

Mark the Guage with Motor Max Amps.and adust the cutting load to a reading of less the Motor Amperage.

Posted elsewhere Amp Meter

Eric

Thread: Poor mans mill feed speed control
25/08/2020 09:00:28

Hi

An Ampmeter on the motor leads to monitor motor current to prevent overloading is a useful addition

amp meter.jpg

Eric

Thread: CL300M Mini Lathe Motor issues
22/08/2020 10:31:20

Hi Dave

Try this Link for Electronic DC Controls A great library of mauals is available at the bottom of the KB's Page

KB Electronics Or Minarik Minarik DC Motor Control Or Dart Dart DC Motor Control

I bought units and motors from Factory surplus spares sales for a fraction of the cost of new units.

Read and Enjoy Eric

21/08/2020 23:20:24

Hi Dave

Welcome

I can speak from experience and with no connection to any company.

My workshop is powered by DC brush motors with American built AC to DC speed controllers form Dart, Minarik, KB Electronics.

With your background it will be no trouble for you to set up the controller to the motor.

Not the cheapest options available but reliable as to be able to set and forget.

Eric

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

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