Search found 148 matches

by Hopefuldave
Wed Mar 04, 2020 4:40 pm
Forum: General Discussion
Topic: Potting electrical coil in steel
Replies: 9
Views: 945

Re: Potting electrical coil in steel

The wire straightener wasn't that clever - I used a hand to guide the wire, but I can't see why the bearings couldn't move - the wire does a figure-of-W around the three bearings to take out any kinks, moving them closer increases tension as the copper has to go through tighter bends 20190407_174726...
by Hopefuldave
Wed Mar 04, 2020 6:50 am
Forum: General Discussion
Topic: Potting electrical coil in steel
Replies: 9
Views: 945

Re: Potting electrical coil in steel

In case this helps... I wound a new secondary for a welding transformer to convert to a 9 kva isolating transformer for my RPC, 3D printed the bobbin and used 6" rotary table to turn it, electric drill on the worm shaft and a lash-up of bearings and washers to straighten/tension the wire (3mm, possi...
by Hopefuldave
Sat Mar 23, 2019 3:25 pm
Forum: Milling Machines
Topic: Show us your milling machine!
Replies: 297
Views: 145955

Re: Show us your milling machine!

Wasn't too shabby Pat, £470 UK, plus about £150 to hire trailer and Hilux to tow it home - it had a couple of faults, one I've fixed (knee elevation screw had lost its keeper, quick fix) and one still to do (electrics need sorting out, main motor contactor seems to be stuck closed so it starts up wh...
by Hopefuldave
Fri Mar 22, 2019 3:11 pm
Forum: Milling Machines
Topic: Show us your milling machine!
Replies: 297
Views: 145955

Re: Show us your milling machine!

I suppose I ought to upload some pics of mine, who knows, someone might recognise it! mill on trailer front countryside slightly cropped.jpg I'm led to believe it's an Italian "Test 2U" from the early 60's, someone on PM had a later model with slightly different motor and electricals, more info' wou...
by Hopefuldave
Wed Sep 20, 2017 5:52 am
Forum: General Discussion
Topic: Machine Tools Should be Floppy
Replies: 53
Views: 8634

Re: Machine Tools Should be Floppy

I *really* want to find this Youtube video now...

Dave H. (the other one)
by Hopefuldave
Wed Aug 30, 2017 6:59 pm
Forum: General Discussion
Topic: Matching a Taper?
Replies: 20
Views: 4934

Re: Matching a Taper?

If you can mount the flywheel, e.g. on a faceplate or in a 4-jaw and get it running true, you can run a DTI mounted to the toolpost against the taper and adjust the topslide (compound) for no movement on the DTI - to get it on centre height adjust it up and down while in contact with the flywheel ta...
by Hopefuldave
Fri Jul 07, 2017 11:48 am
Forum: Lathes
Topic: Need help on my lathe electrical
Replies: 17
Views: 5613

Re: Need help on my lathe electrical

Your post came while I was typing! That's the motor overload, the dial sets the motor's rated full-load current, yes there's a thermal element in it plus (usually) a magnetic element, the thermal averages out the running current and the magnetic measures the instantaneous current, if either goes abo...
by Hopefuldave
Fri Jul 07, 2017 11:42 am
Forum: Lathes
Topic: Need help on my lathe electrical
Replies: 17
Views: 5613

Re: Need help on my lathe electrical

That uses the transformer to supply 24v ac for the contactor coils (via switches etc.). the transformer has a small white rectangular block attached that looks like a fuse holder, might be worth checking the fuse hasn't popped (disconnect supply first, the fuse is at 220!) - without the 24v control ...
by Hopefuldave
Mon Apr 17, 2017 3:29 am
Forum: Lathes
Topic: New here, Hi
Replies: 13
Views: 4095

Re: New here, Hi

I'm surprised nobody suggested it, so I will: Southbend "How to Run a Lathe", old editions are all over t'internet for free download!

Dave H. ( the other one)
by Hopefuldave
Thu Feb 16, 2017 11:52 am
Forum: General Discussion
Topic: Floorplan
Replies: 20
Views: 3753

Re: Floorplan

I like the mill next to the lathe, mount a tailstock on the mill table for those longer-than-the lathe jobs!!

Dave H. (the other one)
by Hopefuldave
Thu Feb 16, 2017 8:00 am
Forum: The Junk Drawer
Topic: Liability
Replies: 58
Views: 13141

Re: Liability

A million in liability insurance isn't so bad, place I used to work had to get 100 million liability cover for my company car - I had to use it airside at Heathrow Airport, at night, I could have run into a 747 full of passengers...

Dave H. (the other one)
by Hopefuldave
Thu Feb 16, 2017 7:44 am
Forum: General Discussion
Topic: VFD QUESTION
Replies: 15
Views: 2478

Re: VFD QUESTION

Re low fan speed, I added a Large fan to my Holbrook's open-frame motor, controlled through a contactor by the VFD: the ABB I use has programmable relays, by setting it to open ABOVE a configurable 'supervisory frequency' (ABB parlance) the fan kicks in if below 35Hz or stationary to cool the motor,...