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Member postings for Les Jones 1

Here is a list of all the postings Les Jones 1 has made in our forums. Click on a thread name to jump to the thread.

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Thread: Cheap linear scale display
01/05/2011 18:40:27
Hi Ian,
The Yadro does not work with any version of windows - it only works with dos.
This means that a very old PC is good enough to run the software. It will not work on modern laptops as the do not have a serial port and dos does not recognise the USB so a USB to serial converter cannot be used. I built my Yadro on stripboard as the circuit is so simple.
Les.
01/05/2011 14:24:19
Hi Ian,
Most of the calipers made in China have this data port. Although the electrical signal are the same there are three different protocols in use. Originally they were mostly 2 * 24 bit protocol and a small number of BCD protocol. about two years ago calipers (and scales) using BIN 6 protocol started to appear mostly in the US. These scale now seem to be more common and the 2 * 24 protocol ones are becoming difficult to obtain. If you want to use a remote display for your scales I have URL's for some sites with designs for stand alone displays and PC interfaces for the original 2 * 24 bit protocol. I agree with JasonB that the scales that Derry has will not be any of these three protocols and will most likely be quadrature signals but we will not know for sure unless Derry is prepared to give some more information on them.
Les.
Thread: Hobbymat lathe speed control.
01/05/2011 11:03:43
Hi Chippychap,
A rheostat is not the same as a variac. A rheostat is another name for a variable resistor. A variac is a variable auto transformer. (I think variac is actually a manufacturer.) From the limited information I can find on your lathe I think the motor is an induction motor. (If it is it will not have brushes.) The speed of these motors cannot be controlled effectively. Your best option would be fitting a three phase motor and inverter package. These have been discussed several times before on this forum. The gear set would have the advantage of giving more torque at lower speeds.
Les.
Thread: Cheap linear scale display
01/05/2011 09:09:04
Hi Derry,
The Yadro design that Steve Garnett mentioned only supports the original 2 * 24 bit Chinese protocol and BCD directly. It can be used with quadrature scales in conjunction with the QCC100 converter from the "Shumatech" website. I have used the Yadro design on my lathe and it works very well. There are several designs (Including source code.) on the web for displays for the 2 * 24 bit protocol. I assume the "old shumatech unit " you refer to is the DRO350. I now have one of these on my mill and lathe and the also work very well. The PCB's and other components are still available for these. I STILL THINK THE FIRST STEP IS TO IDENTIFY THE SCALES YOU HAVE AND THE PROTOCOL THEY USE. I agree with you on your statement that disassembling the DRO350 code is a winter project.
Les.
Thread: Marking out
30/04/2011 08:55:48
Hi mgh,
Arc Euro Trade do split point HSS-Co drills. I only have a few of these (Tapping sizes.) but they work very well.
Les.
Thread: Cheap linear scale display
30/04/2011 08:41:18
Hi Derry,
You say "Large linear scales" but which large linear scales ? I think Steve has given you as much help as possible with the lack of information. The output could be quadrature signals (Either sine waves or square waves.) or could be the manufacturers proprietary standard for example Newall spherosyn.
Les.
Thread: "An Accurate CNC 4th Axis"...?
29/04/2011 15:32:35
Hi Pete,
I do not have a stepper / divisionmaster on my rotary table (6" Vertex) but I have considered putting a stepper motor on it and designing my own controller as it sounds like an interesting project. (No criticism of Tony's Divisionmaster.) I have used my rotary table for cleaning up disks of 2 mm steel and 20 mm chipboard both about 16" diameter. I did not find that any great effort was required to turn the handle but I was taking very light cuts.
 
Les.
29/04/2011 09:38:34
Hi Pete,
I am not clear whether your statement " would not pull the skin off a rice pudding" referrers to the belt driven version or the rotary table version. In your question you do not sate the diameter of the disk you are asking about. The larger diameter the disk is the larger the torque required so cutting say a 15" diameter disk you would have to take much smaller cuts than for a 3" disk.
I had only skimmed the first part of the article on the 4th axis CNC and assumed that there must be some kind of brake mechanism to be shown in later parts. On reading it properly I could see no mention of this so I totally agree with Tony's and John's comments.
Les.
Thread: Diamond tool holder.
25/04/2011 12:39:27
Hi Norman,
I don't have any drawings but I have some pictures on my website of the one I made based on the article in issue 156 of MEW that HJH mentions.
This is the page on my website.
 
I hope that helps.
Les.

Edited By Les Jones 1 on 25/04/2011 12:39:42

Thread: Precision Tailstock Alignment
23/04/2011 12:19:13
I too like mgj's idea. I think before doing this it should be confirmed that there is no dirt between the bed and headstock and that it is seated correctly. (Sorry to repeat this comment from a previous post but I think it is important.) I also think it would worth measuring the centre height of the headstock from the flat surface of the bed so that others could be asked to check theirs for comparison. (If it is not the standard height there would be no point in even considering buying a new tailstock as a possible solution.)
Les.
22/04/2011 09:31:30
Hi Scrim and Gray,
I would be very cautious about attempting to machine the bottom surfaces of the headstock. Even with access to a good milling machine getting the relationship between the" V" groove and flat surfaces will require a lot of care. Even if this is attempted I would suggest checking that the headstock is seated correctly on the bed and checking that the axis of the spindle is aligned with the bed. If it is not aligned then measurements should be taken to enable this misalignment to to be removed when machining the base of the headstock.
Les.
Thread: 'New lathe chuck jaw screws'
21/04/2011 18:38:16
Hi Steve,
The temperature required for silver soldering may well soften the screws so softening them to enable you to drill them may not weaken them any more than the silver soldering.
Les.
Thread: Technical and engineering drawing.
20/04/2011 19:34:40
Hi Gray,
Thanks for making me read Geoff's explanation a second time (and understanding it this time.) I think my rigid preconception that it had to be a cube even hindered my understanding of Geoff's explanation on the first reading. Geoff, I do not think there is anything wrong with your description of the object - it describes it perfectly.
Les.

Edited By Les Jones 1 on 20/04/2011 19:36:37

20/04/2011 18:06:06
Hi all,
I'm prepared to admit that I haven't worked out the answer.
Les.
Thread: Epoxy Bearing Materials and Method
20/04/2011 13:39:16
Hi John,
I apologise for being suspicious of downloading your file.
Regards Les.
20/04/2011 10:32:54
Hi All,
I have some suspicions about this post. clicking on the link opens more web pages. I could be wrong but would advise caution on downloading and running the power point presentation.
Les.
Thread: MiniMill Table Accuracy
19/04/2011 22:42:02
Hi All,
I do not think poor tramming would influence these results. The only time the Z axis is moved during these tests is to bring the DTI in contact with the table so the Z axis not being perpendicular to the X and Y axis would not matter.
Les.
Thread: Technical and engineering drawing.
17/04/2011 22:49:50
Hi Terry,
I also think it would be a good choice for a series of articles as it deals with the problem from both ends. It would help improve the standard of drawings presented for publication and it would help readers with understanding the conventions used. There could be no better evidence for this then the thread you mention where no one on this forum can work out what the drawing means.
 
Les.
Thread: VFD Drives
17/04/2011 17:20:11
Hi Jon,
How are you measuring the running cost of your inverter ? I suspect that the units being sold to monitor your power consumption may not give accurate results with the current waveform drawn by the inverter. I think the best method is to count revolutions of the wheel in your electricity meter and calculate the cost from that. If the results are correct then there must be a lot of heat generated somewhere as the power is not doing any mechanical work.
Les.
Thread: Precision Tailstock Alignment
17/04/2011 12:38:23
Hi Scrim,
Could it be that the headstock is high due to dirt between it and the bed rather than the tailstock low ? What is the history of the lathe ? Knowing that would help people with making suggestions.
Les.
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