Member postings for Emgee

Thanks Neil and Bob for info, I now have more info on the gear having stripped the box down, pictures in my album.

Bevel gear 2.75:1 output:input. Pinion No of teeth =12

Large gear Diameter 57.80mm, No of teeth=33 1.5 MOD at centre of 9.5mm wide gear tooth.

Tooth Angle is approx 17 degrees (107 deg from vertical axis)

This box is from a wind out awning that skips teeth when winding in. Bought a new box but there is so much free play in the spindle, and 30 degrees of backlash between gear teeth, I'm concerned it will need replacing again very soon if I fit it.

Any more help very much welcome.

Rgds, Emgee

Hi

Bevel gear box with approx 3:1 input to output ratio, gear axis at 90 deg.

Read Ivan's book and other related info but still unable to calculate dimensions and angles required. Any and all help appreciated to design/dimension parts.

Max OD to be 40mm

Gear DP as large as possible within size/ratio restriction.

Emgee

Hi Len

Noticed the table you mention tilts 45 deg each way so may not always adjust to the angle needed.

If you are using it for fairly light work making your own is one way to go, I made 1 to use on a mill that has

a flat plate drilled to take a 3" chuck or vice and will rotate a full 90 degrees.

Picture will be added to my Album.

Rgds, Emgee

Hi David

If you do as Michael suggests while it is upside down and set parallel to the X axis you can mill a shallow groove for fitting a tenon into that will align the vice jaws with the X axis. The tenon of course is a sliding fit in the table Tee slot so will save setting time for almost all work. (If you have a universal mill the above will not be true unless the table is checked for truth. ie: not set at an angle)

Rgds, Emgee

Hi Martin

Seems the problem is starting current, this will be several times the run current for a brief period until the lathe gets up to speed. If you have put 15Amp fuse wire across the blown cartridge fuse remember the wire will take up to 32A to rupture, the flash when rupturing will produce a lot of heat so be careful.

You most likely need a dedicated 16A circuit wired to an isolator and motor starter, this way you will have a means of isolation, no-volt protection and with the correct overload fitted protection against motor overload.

Rgds, Emgee

Machined some more model engine backplates on my old Emco F1 cnc milling machine today, took the time to make a short video, link is below http://youtu.be/KRiiEywpzZk

Some pictures in my album.

Emgee

Edited By Emgee on 15/07/2014 23:19:56

It may not be possible to use a 230v inverter if the motor is wound in the Dahlander form. Emgee

Further to Colin's tip about using a 30ma RCCB (Residual current circuit breaker) my advice to all who have a workshop is you cannot afford NOT to have such a device either in the main power supply or better still on individual power circuits, they are proven life savers.

Rgds, Emgee

Hi Bazyle, just added a few more pics in my TH album this is 1 showing type number on the head of the electrode.

See my Taylor Hobson Album for more pictures of the later type transformer and etching head, looks like 10v and believe it was DC, the current to the etcher was switched on/off by the action of a solenoid acting on a set of contacts taking power to the etching needle, (current passing through the coil breaks contacts) this was all built into the head. The etching depth was adjusted by using different voltages on the transformer output and is great for all metals, especially HSS and toolsteel.

I used it on a TH model K machine, probably the RollsRoyce manual operated engraver.

Emgee

Hi Neil, link from Home page to Parts list is fine but the link to "Find out more" takes you to a blank page.

Rgds, Emgee

Thanks to all for the info, will have to decide if I'm ever going to revive them.

Emgee

Thanks Ady, they do look like very similar design, still curious about the Tee slotted cross slide.

Hi All, I have had these 2 old lathes for many years, never been able to find a makers name, any info welcome.

Several more pictures of these lathes in my album.

Emgee

Edited By Emgee on 21/03/2014 10:21:55

Edited By Emgee on 21/03/2014 10:22:39

For the newbie needing some guidance on HSS tool grinding there are some very good videos on Youtube, watch out though because some are not so good, check the comments and number of views.

Emgee

Hi Bogstandard2 Mike, thanks for the link to your ER32 collet holder pages, looks fine to me so will sort out a billet !!Rgds, Emgee

Hi Michael and All

Another video with facing, turning, inside and outside radius, taper, threading and boring, all on 1 video. Must fit a greater nose rad tool for the taper cuts !!!!!
http://youtu.be/aUbmiMLHLD0

Rgds, Marcus

HiMike

Surprised you have that problem with such a lathe. Just ask if the taper on spindle and in chuck are absolutely clean, also of course the mating faces of chuck and spindle.

Is it better by using a particular jaw for tightening ?

Rgds, Emgee

Hi All

Just posted some videos on Youtube to help new owners of these now old hat machines to program and operate using the original control system, G and M codes. "Denford Orac Tutor 1" shows the control panel and keypads then goes on to enter a program with cyclic feature. The other 2 videos show a dry run and finally the program in use cutting an aluminium bar. Link below takes you to the videos.

**LINK**

Rgds, Marcus

Edited By Emgee on 28/12/2013 12:22:59

Lots of good advice given but only the Link answers the question re hole size for the M4 tap. For metric tapping drill sizes deduct the rate of thread from the diameter, this gives tapping drill size for adequate thread engagement in most cases. M4 is 4x0.7mm so 4.0 minus 0.7=3.3mm drill.

Rgds, Emgee