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Member postings for Dave Halford

Here is a list of all the postings Dave Halford has made in our forums. Click on a thread name to jump to the thread.

Thread: How much can a chuck effect finish?
18/04/2019 10:35:36

Are the jaws going bell mouthed when tightened? Basically what XD is saying above

Bruised chuck mount?

Edited By Dave Halford on 18/04/2019 10:36:26

Thread: Poor finish using indexable lathe tools on steel
17/04/2019 10:31:06
Posted by Peter Turvey on 16/04/2019 18:01:23:

XD 351 was right, tip chipped off by the time I took the facing cuts.

rh_tool_chip.jpg

Pete,

You still need to address the stalling / belt slip issue.

You have to be careful with carbide feeds and speeds, the charts all assume sufficient power is available, as in industrial power not hobby. You might loose a few tips before you workout exactly how much depth of cut you can take on your machine.

Thread: Dovetail cutter
15/04/2019 19:21:26

You can find your own proof or the lack of, on tinernet

Thread: Waterproof cabinet / box?
15/04/2019 17:53:48
Posted by Bazyle on 15/04/2019 11:30:55:

Cable cabs don't have mains or even the ELV, it's normally 48v, and all the electronics are in sealed boxes. The telephone wire terminations are the only exposed elements which is why they can suffer from noise on the line.

And the 750W worth of 48v comes from???

15/04/2019 11:21:02

The old ones are simple boxes, the mains supply got no special treatment.

You don't need a Rolls to go shopping

Edited By Dave Halford on 15/04/2019 11:26:03

14/04/2019 19:30:06

It has to be said that every cable company, no matter who built the network does exactly what is being discussed in their streetside equipment cabinets.

They all have mains in them and they can all be touched by the public.

Some get slugs crawling over the cct boards wink.

Nothing dies except the slugs and I don't believe any cabinets catch fire.

The worst thing that happens is single skin ones bake in the summer sun, which kills the batteries.

Thread: Boxford back gear
14/04/2019 11:01:02

From the tumble reverse info on that link it looks like the mk2 is 20pa and the mk1 is 14.5pa.

European 20pa cutters are rare secondhand and a lot of new Asian sets are module and not DP, but HPC is another source of machined steel generic 20pa gears.

Thread: Drill Sharpeners Compared.
12/04/2019 20:58:28

The depth of cut on the Sealey and the like is set by how far the drill sticks out of the holder, all you need to do is stick something on the metal pad, like layers of sticky tape for eample no need to mess with the wheel position.

BTW you can buy new wheels for them.

Thread: Lathe idenification
11/04/2019 15:16:19

This looks like a generic 9x20 lathe to me, sold under many different names and paint colours.

**LINK**

Thread: Is there a way to mask silver solder
08/04/2019 16:39:08

Rust can work or a nice coat of black scale on the dumb axle

Thread: Sending of heavy items
08/04/2019 11:36:10

Though if you haven't a working home printer and or are no longer employed where there is one you can't print the label

Thread: Warco GH 18 Milling Machine
08/04/2019 11:31:04
Posted by JasonB on 08/04/2019 11:23:34:

Dave, you did miss off that the AC motor will probably give the best torque of all as the machine will be driving through a gearbox/belts and always running at it's optimum temp so no overheating at slow speeds.

DOH! wink

Thread: Slot Drills
07/04/2019 21:29:11

That cutter looks off set to me, so it should plunge.

Does you machine have sufficient power at the speed you are using?

Thread: Centec raising block
06/04/2019 17:05:54
Posted by Paul White 3 on 04/04/2019 09:09:22:

Dave Halford.

Your proposed - push back and clamp is the process I use, but had not been told that I couldn't!

Hi Paul,

It's one of those re-tram moments people like to avoid, personally I don't like the idea of the VH hanging that far forward and I just KNOW I'd headbutt the thing even with the head swung horizontal.

03/04/2019 17:57:20
Posted by Gary Wooding on 03/04/2019 16:06:05:
Posted by Dave Halford on 03/04/2019 12:13:51:

Most Centec raising blocks are made from aluminium.

With a 2B you can make a full length arm, the only pain is the clamp cutouts where you will need 4.

Why?

All the raising blocks I've made had only two cutouts.

Good point Gary, I was thinking you would push the head back and clamp it, but you can't. DOH!

PS My Centec2 has narrower dovetails than my late model 2A, but only a few thou.

Edited By Dave Halford on 03/04/2019 18:01:31

Thread: Centec 2a
03/04/2019 15:23:51

It does, there are sliding spacers at each end of the shaft but I think there's a woodruff key to stop the gear turning on the shaft or possibly a grub screw. Mods have been made over the years so could be either.

Is the rear bearing coming out?

Thread: Centec raising block
03/04/2019 12:13:51

Most Centec raising blocks are made from aluminium.

With a 2B you can make a full length arm, the only pain is the clamp cutouts where you will need 4.

Thread: Natural gas for TIG welding
02/04/2019 10:40:57
Posted by XD 351 on 02/04/2019 00:56:34:
Posted by Carl Wilson 4 on 01/04/2019 19:12:14:

Helium is an excellent shielding gas for tig. Especially good for steel. It increases arc penetration for the same current.

that is why it was also known as heli arc welding i guess .

And also makes the weld lighter which is why NASA uses it so much.

Thread: Centec 2a
02/04/2019 10:30:41

Hi Matt

You need to remove the two bungs (which are secured by grub screws hidden in the knee dovetail) using the threaded holes in each bung (bolt must be full depth) and two jacking bolts, one either side of the bung.

Once the bungs and rear retaining plates and seals are removed the shafts can be tapped out from the front toward the rear (there are no steps in the column to locate the bearings.) Sounds simple but everything is very tight.

Clean out the bearing oil galleries in the column as they clag up and also soak the rear Gits seal in oil before it goes back in.

Forgot to add everything has to come out to do the bearings

Also one bung has a cutout, put it back in the same orientation.

Edited By Dave Halford on 02/04/2019 10:33:00

Edited By Dave Halford on 02/04/2019 10:46:56

Thread: QCTP material
31/03/2019 21:09:10

5 minutes in google gives me en3b

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