I doubt that “lukewarm” temperature after 20 minutes is caused by bearing preload, it’s caused by the rollers and cage skidding around in the outer race.

You should be able to feel a temperature…[Read more]

Thanks for coming back and giving us an update on your progress. Glad that you’re back up and running – at least for the most part.  I hope you manage to resurrect the rest of the machine soon.

John

I have just cancelled the Octopus ‘Survey’ that I had booked for13-October

… it has become self-evident that the paraphernalia associated with their cuddly little ‘Cosy’ Heat-pump cannot be accommodated in my small bungalow.

I have now engaged with a local, award-winning, installer … who might have some better proposal.…[Read more]

Essentially a central heating pipe clamp ( the one connecting to a wall) has broken, but this is an old system and I simply can’t find a replacement. Searched the web and even checked many AI results…[Read more]

If the cutter is set straight along the bed it should cut steel, feeding just hard enough to produce chips and produce a straight cut spur gear for mating to other straight cut gears. Don’t mix these with the ones from your lathe.

He suggests 60 – 55 / 65 – idler – 45 as close enough at 0.19697. But that would be for a change-wheel machine. I don’t know about one with a gearbox. Mine is without.

The steel one has angled teeth and I would also hazard a guess they are cut with a hobbing action. Running a straight cut steel gear against your old worm may not do it a lot off good

Looks like the cutter spindle may be set at an angle but is being fed along the bed as I can’t see any…[Read more]

If you count the visible teeth in the photograph and extrapolate to the full perimeter, it seems to total more than 13.

Clearly, the only person to give a definitive answer to the required tooth count is the OP, but it may be that a number 8 cutter is not the correct one.

On 25 September 2026 at 20:51 JasonB Said:
Franco, I do not have a Myford but I’m sure one of the many owners here will suggest how you can get 5mm pitch or 5.094tpi from what looks to be a gearbox equipped Myford.

If only it were true.

On 25 September 2026 at 18:29 bernard towers Said:
OD and No of teeth would help

The teeth have the same pitch as the MyFord Super 7.

On 25 September 2026 at 19:06 JasonB Said:
Franco, see John F’s post after mine, I was not sure of the DP but John says it is 16DP not the 20DP I thought so you need 0.1963″ pitch which is approx 5mm not 4mm…

[Read more]

On 25 September 2026 at 18:21 Huub Said:
That number 8 gear cutter could also be for a 135 tooth gear, depending on the table you use.

It only depends upon whether the cutter is for imperial or metric. For imperial (DP) gears the number 8 cutter is used for 12 or 13 teeth. For metric (module) gears the cutters are numbered the other way round, so…[Read more]

Depending what change gears you have it should be possible to get very close. You may have to drive the leadscrew by hand and let the gear train drive the spindle rather than use the motor.

Thanks, Franco

A number 8 cutter is intended for 12..13 tooth gear, quit small.
22 DP is about module 1.155, a non standard value.
Check the dimensions of the gear to be sure it is 22 DP.
Besides the DP you also need…[Read more]

I think you will struggle to find one with that small bore.

RDG and eBay have 14.5 PA with 1″ bore.

Off topic, but language is really fun. Pinched, Nicked, of course generally mean different things over here, but growing up with…[Read more]

Thanks so much for the help info is really helpful as is usual from colleagues and fellow modellers

joe

(usual disclaimer)

I think my efforts with my Emma Victoria are pretty poor in comparison, but then I go into my workshop and study it all and think, well it’s not too bad really in fact quite proud of it.

Bill D.

Regards Nick.

Can I ask what lathe did you do this experiment on?

Southernchap, you are quite right the first test should be at the tool tip to be accurate. However on my WM180 it makes no difference with 10mm of tool and 10mm of compound projection.

As far as I am aware the spindle at the front bearing is 30mm od with a 20-22 mm hole and the cutting point is…[Read more]

Just purchased back issues of ME 1971 Martin Evans “Green Arrow” with all the relevant issues.

Also i have 6 full size drawings( a duplicate of sht3} but sht1 is missing not a problem as all the bits are in the article.

I would like to see if possible i could locate sht1 if anyone can help.

thanks

Joe

On 24 September 2026 at 18:52 old mart Said:
…as the meshing is not exactly correct.

Please could you expand on this statement and say what is incorrect. When you talk of meshing not being correct, in my head it implies that the required conjugate action does not take place.

We produce spur gears by hobbing and a hob is little different to a…[Read more]

I must admit I am very impressed by D.A.G. Brown’s ability to fabricate these things to his design: the overflow channel is a tiny piece of brass tube with a slot along its length, and its upper port a needlessly awkward “oval” .

I worked from an enlarged…[Read more]

On 23 September 2026 at 21:41 Phil S Said:
Prior to this change might I suggest a little experiment. Attach a dial gauge indicator to the bed with the stylus vertical on the corner of the compound slide where the tool is usually positioned. Apply a downward load to the corner and note the deflection. Repeat with the stylus on top of the chuck…

[Read more]

I replaced my 4 way tool post for a self made qctp. Now I can swap tools in a second with excellent repeatability.

A video of the old version of my qctp. In the new version the top plate doesn’t need to rotate any more.