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They were developed from the E series collet by the Swiss tooling firm Rego-Fix and patented by them in 1973. The E series, which I believe are now obsolete, didn't have the circumferential groove in the collet nor the eccentric in the nut. So ER started as a marketing name and became a widely recognised reference term.

@adformer9212 well spotted, The loco I’m building uses the fell system with a third rail drive for climbing steep inclines. Here’s link to a video of how it works th-cam.com/video/3tX2qs2q5-0/w-d-xo.htmlsi=wEtGnyt3PK4KyNL2

@@SS-Workshop Interesting, I've never seen a steam locomotive with such a system on it before, closest I know is a Cog railway.

Hi, i understand the optimum DRO uses magnetic scales. I used a ridged type magnetic scale DRO on my previous mill / lathe combo. They seemed to work fine, I don’t recall any issues. They were effectively just oversized digital calipers. The optimum DRO looks to just use flexible tape for the scale which would be easier to install I guess.

Same here. This video saved me. I was on the edge of sending my new collet set back and leaving a withering comment. Said in another way - i was on the brink of making a complete moron out of myself. But then i found this video. All of my 19 collets are fine, the holder is fine and the wrench also. And all that for under 80,- €.

Yes, it’s performs really well and I’m still really happy with it.

The project was on hold while I renovated a house, I hope to get back to sharing the build soon.

I don’t turn much stainless but do quite a bit of mild steel, it parts ok but has a habit of digging in if the tool is to low, blunt or not smoothly advanced.

@@SS-Workshop I have the sieg C6, I use a riser block instead of the compound and have just finished a rear toolpost that I use with a tapered 2mm HSS blade for AL and Brass and a 2mm carbide insert tool for stainless and mild steel. The rear mounting has certainly improved things but the overall lack of rigidity is the main issue with the machine.As someone else has said constant feed pressure also helps so a motorised cross feed is something I am working on together with an electronic lead screw. However, if I were younger or more serious I would be looking for something heavier and greater rigidity.

@@michaellinahan7740 I might have to have a go at the rear mount, there is always room for improvement on what I’m doing now. I considered the solid riser but the thought of losing the compound has kept me away from it. I keep looking at bigger lathes just haven’t found a way to justify it yet! Cheers Chris.

Hi Keith, well spotted I glazed over that without showing. I scribed a line on both ends with the part pinned on a flat surface, at about 2:40 you can see the layout blue marks on one end where is was scribed. The drilling was done in a mill with the centre accurately located then offset. Cheers Chris

@SS Workshop Nice job Chris.

Hi Jim, I have found it to be good for the work I have done. I usually run up to about 12mm end mills but also a 50mm face mill. My previous mill was a small combination lathe mill which I found to be no good as a mill. I think it really comes down to your expectation as benchtop mills are always going to be limited by the body size and weight.

These little lates just stall when it goes wrong so less than you would think.

Thanks, not sure but likely so as seems to be similar setup for most of their mills.

Hi Jack, the project is on hold at the moment while I get some other projects around the house sorted but hope to continue sharing when I resume work on it. It will likely run at a local club once done. Cheers Chris

@@SS-Workshop Don't know if there is a 3.5" track in wellington, closest is picton I think or pamnua. Looking foward to the build, good luck. Thanks Jack

@@jackgonscak5239 interesting can’t say I checked. Maidstone would be my closest club which has a raised line but not sure if they have a 3.5. The build was the draw for me but would be nice to see it make an occasional run so will need to find a track at some point. Cheers Chris

Maidstone has 2.5", 3.5", 5", and 7 1/4". I think petone might have 3.5" as well. Currently we are looking to start a 3.5" and smaller convention similar to the CANMOD which has just taken place in chch which will probably be held Blenheim/Nelson so it's not to far for those over on that other island to join in 😝. Might give you something to work towards. If it makes you feel better my 3.5" rebuild I started at the same time you started which was to take 3 months is still going. Learnt the hard way to build and not buy 😂

@@jefferyfarrell thanks for that, I probably should pop up the road and take a look one of these days, plan B was a line in my backyard. You never know I might finish it one day…. Just got to stop finding excuses or stop letting them find me 😆. I hope all is well down your way, great to hear from you. Cheers Chris.

Thanks Paul, it doesn’t surprise me there are errors, the chart looks like it’s a copy of a copy so you have to wonder if the manufacturer has ever checked it. I have to say it would be quite annoying if you discovered this in the last tooth of a gear or hole in a bolt circle on a finished part.

@@SS-Workshop Thanks! Just for fun, here is the complete DP-1. I have put an assertion condition in the code that checks that each printed row contains the correct values. The algorithm chooses the simplest possible quotient. For example 8/16 instead of 10/20, because 16 is the least even division on disc A. It should be easier and safer to adjust the sector arms with fewer holes to count. I found some surprising examples where they had missed to reduce the quotient. Disc A: 15, 16, 17, 18, 19, 20, Disc B: 21, 23, 27, 29, 31, 33, Disc C: 37, 39, 41, 43, 47, 49, Worm ratio: 90 T H N 1 90 2 45 3 30 4 A-16 22 8/16 5 18 6 15 7 B-21 12 18/21 8 A-16 11 4/16 9 10 10 9 11 B-33 8 6/33 12 A-16 7 8/16 13 C-39 6 36/39 14 B-21 6 9/21 15 6 16 A-16 5 10/16 17 A-17 5 5/17 18 5 19 A-19 4 14/19 20 A-16 4 8/16 21 B-21 4 6/21 22 B-33 4 3/33 23 B-23 3 21/23 24 A-16 3 12/16 25 A-15 3 9/15 26 C-39 3 18/39 27 A-15 3 5/15 28 29 B-29 3 3/29 30 3 31 B-31 2 28/31 32 A-16 2 13/16 33 B-33 2 24/33 34 A-17 2 11/17 35 B-21 2 12/21 36 A-16 2 8/16 37 C-37 2 16/37 38 A-19 2 7/19 39 C-39 2 12/39 40 A-16 2 4/16 41 C-41 2 8/41 42 B-21 2 3/21 43 C-43 2 4/43 44 45 2 46 B-23 1 22/23 47 C-47 1 43/47 48 A-16 1 14/16 49 C-49 1 41/49 50 A-15 1 12/15 51 A-17 1 13/17 52 53 54 A-15 1 10/15 55 B-33 1 21/33 56 57 A-19 1 11/19 58 B-29 1 16/29 59 60 A-16 1 8/16 61 62 B-31 1 14/31 63 B-21 1 9/21 64 65 C-39 1 15/39 66 B-33 1 12/33 67 68 69 B-23 1 7/23 70 B-21 1 6/21 71 72 A-16 1 4/16 73 74 C-37 1 8/37 75 A-15 1 3/15 76 77 78 C-39 1 6/39 79 80 A-16 1 2/16 81 A-18 1 2/18 82 C-41 1 4/41 83 84 85 A-17 1 1/17 86 C-43 1 2/43 87 B-29 1 1/29 88 89 90 1 91 92 93 B-31 30/31 94 C-47 45/47 95 A-19 18/19 96 A-16 15/16 97 98 C-49 45/49 99 B-33 30/33 100 A-20 18/20 101 102 A-17 15/17 105 B-21 18/21 108 A-18 15/18 110 B-33 27/33 111 C-37 30/37 114 A-19 15/19 115 B-23 18/23 117 C-39 30/39 120 A-16 12/16 123 C-41 30/41 126 B-21 15/21 129 C-43 30/43 130 C-39 27/39 135 A-15 10/15 138 B-23 15/23 141 C-47 30/47 144 A-16 10/16 145 B-29 18/29 147 C-49 30/49 150 A-15 9/15 153 A-17 10/17 155 B-31 18/31 160 A-16 9/16 162 A-18 10/18 165 B-33 18/33 170 A-17 9/17 171 A-19 10/19 174 B-29 15/29 180 A-16 8/16 185 C-37 18/37 186 B-31 15/31 189 B-21 10/21 190 A-19 9/19 195 C-39 18/39 198 B-33 15/33 200 A-20 9/20 205 C-41 18/41 207 B-23 10/23 210 B-21 9/21 215 C-43 18/43 222 C-37 15/37 225 A-15 6/15 230 B-23 9/23 234 C-39 15/39 235 C-47 18/47 240 A-16 6/16 243 B-27 10/27 245 C-49 18/49 246 C-41 15/41 255 A-17 6/17 258 C-43 15/43 261 B-29 10/29 270 A-15 5/15 279 B-31 10/31 282 C-47 15/47 285 A-19 6/19 288 A-16 5/16 290 B-29 9/29 294 C-49 15/49 297 B-33 10/33 300 A-20 6/20 306 A-17 5/17 310 B-31 9/31 315 B-21 6/21 324 A-18 5/18 330 B-33 9/33 333 C-37 10/37 342 A-19 5/19 345 B-23 6/23 351 C-39 10/39 360 A-16 4/16 369 C-41 10/41 370 C-37 9/37 378 B-21 5/21 387 C-43 10/43 390 C-39 9/39 405 A-18 4/18 410 C-41 9/41 414 B-23 5/23 423 C-47 10/47 430 C-43 9/43 435 B-29 6/29 441 C-49 10/49 450 A-15 3/15 465 B-31 6/31 470 C-47 9/47 480 A-16 3/16 486 B-27 5/27 490 C-49 9/49 495 B-33 6/33 510 A-17 3/17 522 B-29 5/29 540 A-18 3/18 555 C-37 6/37 558 B-31 5/31 570 A-19 3/19 585 C-39 6/39 594 B-33 5/33 600 A-20 3/20 615 C-41 6/41 630 B-21 3/21 645 C-43 6/43 666 C-37 5/37 675 A-15 2/15 690 B-23 3/23 702 C-39 5/39 705 C-47 6/47 720 A-16 2/16 735 C-49 6/49 738 C-41 5/41 765 A-17 2/17 774 C-43 5/43 810 A-18 2/18 846 C-47 5/47 855 A-19 2/19 870 B-29 3/29 882 C-49 5/49 900 A-20 2/20 930 B-31 3/31 945 B-21 2/21 990 B-33 3/33 1035 B-23 2/23 1110 C-37 3/37 1170 C-39 3/39 1215 B-27 2/27 1230 C-41 3/41 1290 C-43 3/43 1305 B-29 2/29 1350 A-15 1/15 1395 B-31 2/31 1410 C-47 3/47 1440 A-16 1/16 1470 C-49 3/49 1485 B-33 2/33 1530 A-17 1/17 1620 A-18 1/18 1665 C-37 2/37 1710 A-19 1/19 1755 C-39 2/39 1800 A-20 1/20 1845 C-41 2/41 1890 B-21 1/21 1935 C-43 2/43 2070 B-23 1/23 2115 C-47 2/47 2205 C-49 2/49 2430 B-27 1/27 2610 B-29 1/29 2790 B-31 1/31 2970 B-33 1/33 3330 C-37 1/37 3510 C-39 1/39 3690 C-41 1/41 3870 C-43 1/43 4230 C-47 1/47 4410 C-49 1/49 Total number of divisions: 234

@@SS-Workshop (3d) This is bizarre! For 78 divisions they propose B-91 1 14/91. Why, when A-26 1 4/26 gives the same result?

Thanks Paul, will keep a print out with my dividing plates, I’m sure it will come in handy. Maybe not the 4000 ones not sure I can fit that many teeth on a gear haha 😂. As I say I doubt the manufacturer checked them, probably copied from somewhere else and miss typed or worked out long ago on paper and copied ever since. Cheers Chris

@@SS-Workshop I'l try to toss a printout into Excel to make it a little more legible. I don't guarantee that all data are correct, even though I believe they are. You can always make a simple safety check before you cut out everything that is not a gear wheel. If the table says T ... N H/steps, then this equality shall be true: T*(N*H + steps) = 90*H (I suppose your worm ratio is 90). This property is of course checked in my code just before printout, but ... there might be a bug in the CPU. 🙂

You will have to wait a little longer but it will come, thanks for your interest.

Metal change gears but understand there is a plastic one in the system somewhere but hasn’t given me any trouble

Thanks, I haven’t finished it yet, home renovations have got in the way but hope to get back to it soon. Check out episode 45 to see where I’m at currently.

@@SS-Workshop all in due time xD. There's 43 other episodes to see ^.^

Hi Neil, thanks for thinking of me, much appreciated. I probably don’t have to much use for spare parts especially as my shed is overflowing with stuff but keen to know a couple more details on your cnc conversion if you don’t mind. Its certainly something I would like to do to the optimum in the future if I pick up a bigger manual mill. If you have any pictures and/or info on the parts you used I would be really interested my email address is sswkshop@gmail.com Cheers Chris