Here is a list of all the postings ChrisLH has made in our forums. Click on a thread name to jump to the thread.
Thread: Spur gear diff rotation. |
31/10/2021 14:58:08 |
Logic and intuition win through! Shaft C will rotate in the same direction as Cage B (i.e. clockwise in this case) but at twice Cage B's speed. |
Thread: Super 7 questions |
16/10/2021 22:57:15 |
Somebody mentioned recently that interposing a piece of cloth between nipple and Myford gun improves the sealing . It works, after 50 years of oiling everything but the bearings I can now do the job properly. |
Thread: a little diversion |
10/10/2021 15:44:04 |
Start off by fixing gear axes. Then if large gear is rotated 1 rev clockwise, small gear rotates 3 revs anticlockwise. Then to get the large gear back to the beginning the whole lot must be rotated 1 rev anticlockwise in which case the small gear will have made 4 revs anticlockwise. Is there a fallacy given that 4 is not one of the listed answers ? |
Thread: Home CnC |
09/10/2021 20:42:21 |
Brian, I have had a Wabeco with CNC since 2004. It works OK for me doing 2D and manual work. It uses the software supplied at the time (PCLathe/Mill PLUS) which is fine once you have put the initial learning effort in like all these things. However the software is no longer supported (support which I've never needed) so I suppose it's supplied with something more up to date these days. The machine is quite rigid but I do have some mechanical niggles which I've learned to live with. Not everything German is perfect ! If you need further info about my experience, please PM me. Chris LH |
Thread: How important are odd-sized milling cutters? (Clarkson vs ER) |
12/07/2021 10:57:18 |
Martin, So the Vertex Posilock needs special 16 tpi "Clarkson" type cutters as opposed to the ordinary ones which are 20 tpi ? Chris |
Thread: Centaur Carburettor |
03/07/2021 11:50:07 |
Clive, ETW describes a similar, grooved seat carburettor on page 124 of his book "Model Petrol Engines" (Tee publishing). He also describes how it's supposed to work. This carb. apparently introduces all its fuel via the groove whereas I gather the Centaur carb. must have a second way of introducing fuel since it runs without the groove. If you need further details, PM me and I'll attempt to scan the relevant pages for you. Chris |
Thread: Tea Spoons |
24/03/2021 21:27:56 |
Our 50 year old cutlery set (Rogers, Sheffield) which visits the dishwasher every couple of days is still bright with the exception of the knives whose blades are stained and, as a result, are now hand washed. Spoons, forks and knife handles are made from austenietic stainless but knife blades, in the interests of keeping an edge, are made from martenstic steel which is more corrodible. Don't know what our cheap spoons of unknown origin are made of. They are very nearly black with deep corrosion, often show rust spots and are irretrievable. Perhaps Rogers and firms like them no longer exist because their products lasted too long ! |
Thread: SX2P Gas Strut Modification Issue? |
04/03/2021 20:24:01 |
I had similar problems to the OP with my milling machine. Specifically, the head had a habit of making its way down into or up out of the work depending on how tough the going was. Of course, it was OK if I locked the z axis but this is not an option for CNC operation. My chosen solution was a heavy counterweight (album photo) of sufficient size to ensure that the leadscrew was always loaded in the upwards direction. The application point of the counterweight load was estimated to minimise the couple, and therefore friction, experienced by the z axis slide. My analysis of the mechanics suggests that this application point is not in line with the leadscrew. To do this properley one would need to know the weight of the counterweight, the weight of the head and the position of its centre of gravity. Rather a tall order in the case of the latter two measurements but perhaps doable on a small machine. To be clear, the aim would be : weight of head x distance CG of head to leadscrew CL = weight of counterweight x dist. application point to leadscrew CL Offered as food for thought. Chris |
Thread: Drunken Threads |
22/12/2019 16:46:48 |
A while back I was making some BA screws using my tailstock dieholder. I was surprised to find that the resultant threads were deformed having lots of space between the undersized metal bits. Just what I was expecting to avoid. On examination I could see that the die was not sitting squarely in its holder.Tthis seemed to be caused by the relative positioning of the tapped adjusting screw holes in the holder and the dimples on the OD of the die. Tightening the adjusting screws just pulled the die out of alignment. Since then I have resorted to mounting the die in a hand held holder kept square to the work by the inner part of the tailstock dieholder bearing on the face of the die itself, not the holder. It's all rather awkward but produces satisfactory threads. Anybody else had similar problems ? |
Thread: Hydraulic Motors |
09/11/2014 17:50:10 |
Hello Carl, Just noticed your enquiry and thought you may be thinking of Roy Amsbury's articles in Model Engineer some while back. He had a go at a 5 inch gauge Hymek locomotive and started of with a hydrostatic type transmission. This didn't work out in the end despite heroic efforts on Roy's part and he finished up with a mechanical transmission. It's all described in MEs for 17/06/88, 15/07/88, 19/08/88, 16/09/88, 21/10/88 and 18/11/88. Even if inapplicable or too late it's an interesting read. Chris |
Thread: true flat bottom end mills |
17/09/2012 17:06:31 |
Just to do it to death how about :- Mill slot using standard end mill thus leaving a convex surface Set up in the lathe and then rotate the work back and forth by hand through part of a revolution to trim off the excess using lathe tool, cross slide, etc. as in normal work. As we are talking small nimbers of thous. this should not take long. |
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