The Craftmans Shop > New from Old

Reviving a Britan Lathe.

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dvbydt:
Posted here last night but it is not showing? Forgive the duplication if you get two for the price of one.

Anzaniste, it is a very interesting design, I will post a picture of the attachments in the next post.
Pete, yes thanks  I have seen that. Considering how many subcontractors had at least one of these, there is not much information on the net.

I wanted to return the controls to original as much as possible, so I made up a coaxial Fwd/Rev speed change switch. Details attached.
The motor was  standard 3 phase and delta connected1.1kW, 1420 rpm. The VFD a Teco E2 40 3NF rigged for 240 volts input.
The easiest to understand programming details were at :-  http://www.teco.com.au

Sorry, I am not very good with explanations but for those of you who are familiar with setting up VFDs, this is what I did.

Programming F19 = 2 and F20 = 6 allowed me to set F08@20Hz, F26@35Hz and F27@50Hz. This gave me three fixed speeds, so with the mechanical High/Low clutch, there is a choice of
six speeds.

Ian

dvbydt:

So another couple of photos.
The black control is for fwd/stop/reverse and the top red is for the VFD speed change selector. The lower long lever is the mechanical clutch high/low lever. Speed range is from 60 - 2000 rpm without changing any belts. Being programmable, the speed range can be altered if a special need arises for a production run.

Tooling photo shows the tailstock turret with tap and dieholders. Main tailstock holders can have larger drills, taps and dies, drill chuck, ER collet chuck or live centre.

More to come when I get it cleaned down after getting brass swarf everywhere!

Ian

dvbydt:
On Youtube with sound! The VFD controls the maximum amps on ramp up and down, so the motor will happily go from fast forward to fast reverse. Very
happy with how it all worked out.

     




Ian

RobWilson:
Sounds fit and well Ian  :thumbup:

Rob

dvbydt:
The original had a cast aluminium coolant and swarf guard which was missing on this machine, so I decided to make one from 3 mm sheet aluminium. I solved the corner problems using a 19 mm x 3 mm wall tube and cutting them on the lathe with a parting tool mounted on it's side. The sheet was cut to size and I used BrazeTech solder to join them all together. Quite solid. There was a splashguard cover with a plastic window originally but it got covered in coolant - it was not very good, so I did not try to put in a window. I undercoated them with Hammerite Special Metals Primer then Hammered Dark Green.

Ian

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