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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: carbide insert tooling
12/07/2021 20:37:21

The US Postal Service used to be reasonable, I bought a spare amp for my 69 jukebox and the cost was OK.

Then the US post stopped exporting, now it's run privately they can charge what they like.

Thread: How important are odd-sized milling cutters? (Clarkson vs ER)
12/07/2021 20:30:36
Posted by duncan webster on 12/07/2021 20:12:39:

?? my 3/8 BSW stuff fits in the horizontal as well, and it has a captive drawbar

Mines a 2A so might be older than yours, but but the 2 that I had and the 2A will not pass the VH drawbar through the shaft. I have to put the draw bar in from the front, M6 studding fits and a loose M6 nut at the rear.

12/07/2021 20:09:10

The Centec horizontal shaft is smaller than 3/8, just to be awkward.

Thread: Blown Bricks : Advice please !
12/07/2021 09:42:12

Michael,

I used to live in a 30's house which had that issue beneath the damp proof course. The front garden wall was similarly affected with some good bricks.

I used the surviving 20% good bricks from garden wall to replace the house ones, you can chisel the old ones out if bad enough. Otherwise it's a filthy angle grinder job.

If your spares pile has any undamaged ones they should be good, but you need either semi engineering bricks for the top of a wall or shaped capping of some kind.

It might pay to leave it another winter to expose the full extent of the damage and buy any replacements after they a have stood in the yard and had a good frost.

Thread: Cleaning Circuit board - Replacing NiCad Batteries
10/07/2021 17:42:37

Replace the negative wires, black wire corrosion wont go away.

Buy good cells with a long date

Thread: end milling does my Doreen needs a blast
09/07/2021 11:33:59
Posted by brian jones 11 on 09/07/2021 06:30:51:

I have seen how the small swarf particle congeal around the tip and quickly obscure the work ( magnetism?)

looks like going down a country road in E Africa at the start of the rainy season

Edited By brian jones 11 on 09/07/2021 06:35:19

I get the swarf sticking to the cutter, a cheap (very) paint brush fixes that even though it gets shorter.

If you get blue chips then slow something down.

Thread: Cylinder drain cock thread?
08/07/2021 19:09:42

BSB is 26tpi

Thread: Tool post height
08/07/2021 12:29:51
Posted by brian jones 11 on 07/07/2021 17:08:49:

rocker tool post.jpg

A real mans tool post Rocker or Lantern? Did Myford ever have one of these?

good thinking

Edited By brian jones 11 on 07/07/2021 17:19:56

With those all you need to do is change the base for a flat ring to give you centre height on your insert tool and you'll never have to check insert centre height ever again even if you swap from straight to left or right handed holder in the set.

The boat or rocker requires constant checking every time you move it.

If you use Armstrong holders the same applies for HSS till you sharpen them.

Sometimes the old junk is better than the new junk, depending on how much outlay you have invested in the new junk

Thread: Fusible plug in a 5" gauge copper boiler?
07/07/2021 14:41:35

This may be a case of issue8A and issue8B. there should be a list of changes somewhere.

Thread: Milling machines - western-made s/h recommendations up to 2k
07/07/2021 14:20:58

Yes, that's 14" of total useable travel or 7" each side of the centre line the actual table is 25" total not sure if this includes the power traverse or manual feed handle.

Thread: Corbetts Little Jim Lathe restoration - newbie needs advice
06/07/2021 19:23:10
Posted by Andy Thompson 3 on 06/07/2021 15:03:20:

Thanks Dave.

Yes that tailstock clamp is very Heath Robinson. Any suggestion to improve. I was just going to angle a piece of 12mm steel and try to drill a bolt hole in just the right place. Will that work?

For others who may not have seen it on my intro thread, the tailstock is pictured below. The upper tailstock is held by the pin you can just see an one bolt. So it can be rotated to parallel the bed but not adjust laterally. Any issue?

20210625_185608.jpg

 

Andy,

The fixed dovetail will be pulled up snug to the bed by the wedge action which ensures the tailstock bore is also parallel to the bed.

I would make your 12mm plate at least 2" long and tap it for a stud, the stud position will be critical.

The pin doesn't look long enough to do anything.

3 step pulley.

tIAAOSw0lVgykFK">countershaft link sounds like a 5/8 shaft + blocks

10" pulley  just need to sleeve it

Edited By Dave Halford on 06/07/2021 19:27:42

Thread: Tool post height
06/07/2021 17:56:58
Posted by brian jones 11 on 06/07/2021 16:49:29:

Having invested in an RDG QC tool post system - very nice too - to be fair RDG was totally up front in saying that while the tool post could accept 12mm shanks these are too high for a Myford - 10mm or less ok.

What isnt said is that 12mm is far more common than 10mm. however a brave Myfordian had this solution

 

drastic maybe?

I tried a simple way and milled out the slot of the holder 3mm deeper

this is the result

 

 

 

 

 

20210706_161627.jpg

Edited By brian jones 11 on 06/07/2021 16:50:34

I would expect chatter issues taking so much of the insert support away like that.

Edited By JasonB on 06/07/2021 18:39:15

Thread: Corbetts Little Jim Lathe restoration - newbie needs advice
06/07/2021 14:15:38

The tailstock clamp is wrong, it would not have come with a bolt head to fit a dovetail, using it may damage the slide for future use, cast iron can get nibbled by that setup.

You need another matching cone pulley on a layshaft driven by a 10" or 12" pulley and something like a 2 or 3" on the motor to get the speeds decent as others have said. Current speeds are a bit woodworking.

Thread: advice old British motorcycle
06/07/2021 13:50:40
Posted by A Smith on 06/07/2021 12:14:54:

Triumph Unit 500 twin. Later the better. Excellent spares support from multiple sources. (Somewhat easier to kick over than a B50 - just sayin'

Once you learn the Triumph kickstart jump.

Thread: Milling machines - western-made s/h recommendations up to 2k
05/07/2021 18:52:23
Posted by not done it yet on 05/07/2021 14:13:35:

Previous reports have pointed out the increase in rigidity as the reason for that particular improvement (the knee). The 2B is a considerably more robust machine than the 2A, although I am not sure about the gearbox internals.

The 2B gearbox is the same as the 2A and as the speed shift levers are the same that makes the column the same, but quite a bit taller.

05/07/2021 18:46:08
Posted by Hillclimber on 05/07/2021 11:32:25:

Dave, thanks. That I can really understand as more of 'a thing'.

Cheers, Colin

That's why I put a dro on the Z wink

05/07/2021 11:25:58
Posted by Hillclimber on 03/07/2021 11:00:33:

A wee question for the experienced users on this thread about the Centec 2A/B decision.

Big (literally) difference between the 2A and B seems to be the table size, and travel. But the other is the 'knee' hand wheel repositioning from the back corner to the front of the machine.

My question is just, how significant is that handwheel repositioning?

Cheers, Colin

The real issue is you need space to get around the table to see the dial properly, it makes plunging cuts a little harder to control.

Thread: Hofmann universal dividing head
04/07/2021 12:52:36

Possibly the bolt has been replaced for the wrong length. You may only get part numbers.

Thread: Milling machine in the (wood floored) workshop
03/07/2021 20:51:41

I would use concrete blocks if you already have a concrete base, you can buy singles for £1.66 at B&Q

Thread: Limp Probe
03/07/2021 19:29:30

I take it these dont go big enough (50mm)

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