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Member postings for jacques maurel

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

Thread: Parting off
08/06/2020 21:34:55


Have a look at my article in MEW:N°268 & 269 (june and july 2018) "A switch off attachment for parting off safely"

J Maurel

Thread: genius transmissions
10/04/2020 09:02:24

Videos for the quarantine:





Thread: Griptru wil not ad just
03/04/2020 10:21:15


Read my article in MEW issue 292 about adjustable chucks, more will be said in the following issue about the tightening screws.

J Maurel

Thread: Biax Power Scraper
11/01/2020 09:14:25

Have a look at the video: **LINK**

J Maurel

Thread: Compression springs for the new year
01/01/2020 05:42:33

Bouncing forward in 2020 with compression springs!

Happy new year.

J Maurel

bonne année 2020 p.jpg

Thread: Gear spec for threading dial
25/07/2019 11:04:27

Be careful as the number of divisions must be a submultiple of the number of teeth!


23/07/2019 22:19:10

Note: the number of divisions on the disc must be a submultiple of the number of teeth.

20 teeth is possible with 4 divisions (5 teeth between divisions so 30mm) for the pitches submultiple of 30mm. 6 divisions for 30 teeth. The number of teeth (20 or 30) is determined by the TDI braket position.

20 teeth with 5 divisions for pitches sub of 24 (12, 8 and 4mm)

21 teeth is possible with 3 divisions (7 teeth between divisions so 42mm) for the pitches submultiple of 42. 6 divisions for 42 teeth.

22 teeth with 2 divisions for pitches sub of 66.

26 teeth with 2 divisions for pitches sub of 78.

23/07/2019 14:40:28

I've written an article on the subject for ME but it's not yet published.

you can use a module 2 mm. 30 teeth for pitches submultiple of 10mm (5, 2.5, 1.25, 0.5mm); 42 teeth for pitches submultiple of 7 (3.5, 1.75).


Thread: Gear Measuring
30/06/2019 14:59:07

As the sun gear is 10 teeth, there is certainly a positive addendum modification, and certainly also for the planet gears, These gears must so be cut with a generation machine, or a special drawing made for a fly cutter.


Thread: Upside down reverse threading
18/05/2019 15:37:29

look at my video:



Thread: L.A.Van Royen Twist Drills and their Grinding
11/01/2019 08:19:33

You can read my articles in MEW about drill sharpening (the Van Royen is discribed as conical clearance). Issues N° 245, 246, 247. Issue 251 for small drills, and issue 256 for web spitting. I'm still working on the subject for further articles.

J Maurel

Thread: Snap rings for the new year
01/01/2019 06:42:08

Best engineering wishes for 2019 with the help of some snap rings!

J Maurel

bonne année 2019 p.jpg

Thread: Cutting a keyway without a broach
13/11/2018 07:40:38

This process was also described in "post bag" in the january 2004 issue of ME.


Thread: Knurling Tools
31/07/2018 15:41:33

Have a look at the article "machining shiny knurls" ME issues 4543 & 4545 (sept and oct 2016)

J Maurel

Thread: collet wishes
01/01/2018 07:49:04

Happy new year and best wishes with the ER25 collet set!

J Maurel

bonne année 2018 petit.jpg

Thread: Ball Bearing Speed Reducer
27/12/2017 10:05:39

Now a mulltipliying spindle using the same mechanism.

broche multiplicatrice.jpg

27/12/2017 09:57:00

Hello Neil

Here is a blue print copy of a 1981 exam for driving a potentiometer.

r?ducteur ?pi ? billes.jpg

Thread: Machining Tungsten
16/08/2017 16:57:40

The DENAL density is 17.5 (19.3 for pure tungsten). The copper/tungsten alloy (used for EDM electrodes) density is only 14.

J Maurel

13/08/2017 21:24:42

Surch for DENAL on the web it's an alloy 93% tungsten with iron nickel and cobalt I used it for making boring bars (for low vibration) it's machinable while tungsten is not, but you must use TC taps (I killed HSS ones in this stuff).

J Maurel

Thread: Involute Gear : Pressure Angle
06/03/2017 07:35:02

What is fondamental for involute gears is the « base circle » . Visit my website: **LINK**
Watch the following video:
Begin by the seventh: “The bad gearset” next “ Involute generation from pulleys and belts” next “Involute mechanical behavior” next “Involute and rack” next “Involute gear animation” next “mutiteeth gear”.
I think that this will give some explanations.
I can write an article about “addendum modification” that could be of some interest as many model engineers have made the “jacob’s” gear hobbing machine, if Neil is interested in?
J Maurel

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