Here is a list of all the postings Zan has made in our forums. Click on a thread name to jump to the thread.
|Thread: Which type/brand of razor blades stay sharp longest? (cutting card/greyboard)|
Use a diamond hone to resharpen
They last for ever. I did this at school teaching A level graphic design. Saved me hundreds of blades a year. Even better is at home where an Arkansas whet stone or leather workers type of lap ( leather strip charged with 4000 grit) to polish. Had one blade in for years
Ps do you use a self healing cutting mat?
Edited By Zan on 27/04/2021 14:10:05
Edited By Zan on 27/04/2021 14:10:53
|Thread: Does anyone know what this is for?|
Bending tin plate into a corrugated form for pastry cutters?
|Thread: Machining Wheel Castings|
Ugh. That’s one bad casting
|Thread: Optimising the Life of Cut-Off Wheels|
Interesting link. So key points are
pull rather than push
hold close to the grinder as possible to the disc and
regarding low speed. I found this
“Since wear is cumulative over time, at lower speeds contact time during each revolution of the cut-off wheel is longer and thus wear is higher, resulting in shorter life.”
|Thread: Rex Tingley Valveless design|
He did a series in model engineer a long while back. It was for his stationary, then the loco
|Thread: Boring aluminium - What am I getting wrong|
The tool is in the incorrect orientation, it should be in line with the slide on the boring head and having a little axial twist to give some rake The tool should move radially in relation to the hole when increasing the cut. By the way, how much are you trying to cut, and did you ore drill the hole?
just think about it as a boring tool in the lathe the tool as shown is angled about 45degrees to the lathe cross slide and is elevated way above centre Thus it is rubbing all the time
|Thread: Further Adventures with the Sieg KX3 & KX1|
Ah so you don’t actually “drill” in the cam bit but use a virtual large milling tool in the triangular pocket which is too big to get into the corners ( which is used to fool the cam). I think the rest machining is designed to take out missing parts which the bigger. Cutters can’t get into not used that yet, so many complex things in 360. Not seen or used the “from previous “ more investigation,
ps keep your exploits coming!
Edited By Zan on 18/04/2021 19:43:33
Hi Jason, I’m trying to do a small flywheel in 360 3” dia. I see in your video that the cutter goes round edges of the drilled holes and does not air cut . The cam cannot see these holes and thinks it’s a solid material so will try to cur them, not a problem nut all adds to the machining time. This would be easy in the ventricles 2d (which I now no longer use. Having to manually create contours) by just adding another circle on the face of the stock
Next Now that steep and shallow has gone from the free 360 version, what’s the best 3D cutting type. This is the first 3D Iv attempted, and all the path options in 360 seem to be very similar I have seen you using scallop, and contour I think so which is the best, I did see the discussion with regard to matching the tee piece
ps I did actually add a tube feature with a very thin wall , this seemed to work, but it’s very crude and I was wondering how you produced this bit of magic! The trouble with 360 is the bewildering no of options which can be confusing when it’s only used about once a week. It always seems to take so long to create the 3D design and cam strategy
Edited By Zan on 18/04/2021 10:26:56
|Thread: Steam whistle|
How big is it?
|Thread: Accessing Digital archive|
Ah thanks. Two days ago, but Iv had to change log in details and account details so it matches... I may have got things seriously mixed up I think. So I will wait a couple more days then get back to you.
I am also having problems .. I can’t get the archive and the instructions given do not follow what I see in the pocketmags and model engineer app for my iPad I have entered my subscription number in settings here but still no joy.
the email confirming my subscription payment (done direct from this website) says another will follow. That has not yet happened
Edited By Zan on 09/04/2021 22:55:39
|Thread: Home Made Rear Toolpost Issue|
Slips are extremely useful and mine see a lot of use. Yesterday I was making a yoke for crankshaft to work in. The slips made it very very easy to get file the gauge plate material easily to a very smooth and polished finish. Yes the slot ended up 4 thou too small but I’ll make the split bearing to fit
mine are second hand, from two sets at a total cost of £35.. I can’t work to the limits which a new on spec set would “ measure” to. They just about stack, but I’m very pleased with the number of times I use them
Edited By Zan on 06/04/2021 13:23:00
|Thread: Warco 712 Bandsaw|
My band saw came years ago from Graham engineering (I think. Or was it excel?) Reduced price at the end of Harrogate The blade carrier arms are of pressed steel rather than the usual casting. Had a few problems, the angled saw carrier wasn’t square and had to be bushed and rebored , it took a lot of attempts to get it to cut straight, but now with the addition of a piece of angle bolted in line with the fixed jaw I can cut very small stuff and even recently did a vertical cut in aluminium 8” long, it went straight down the line leaving it perfectly square n parallel. They just take time to set up. I am thinking of adding a dash pot but. It works ok , used virtually every day now it’s in the extended workshop and not in the garage and there’s always more interesting stuff to do.....
Edited By Zan on 03/04/2021 13:50:42
|Thread: Any advice on how to cut/file a 45 degree chamfer on a 1mm steel sheet to EXACTLY 45 degrees?|
Come on Jeff, get real He has very little kit and no room for even a small mill let alone a surface grinder He is asking for advice. Not a scathing unhelpful comment from someone who obviously has a lot of kit
|Thread: Plumbing Overflow - Help!|
Lol been there done that ( almost)
|Thread: Bandsaw overhang|
Good solution John, but I went a bit further. As the outboard platform is wider on my version, I bolted a piece of angle about 2” long there almost touching the fixed jaw . This allows a g clamp to hold very short pieces rigid It is only ever removed and reset when a rare angled cut is needed. It could still be fixed to your lower insert bar. The advantage of this is that it supports the work and removes the twisting caused by the cutting action, thus making it easier on the vice.
|Thread: A Certain Age|
I came on here today to read a particular thread, but having read all this great funny one. Iv forgotten what it was......
I was always taught never start a sentence with “and”....... or am I the dolly old duffer?
Edited By Zan on 10/03/2021 13:42:41
|Thread: A Cornish conundrum|
A photo would help
|Thread: SX2P Gas Strut Modification Issue?|
rod Interesting! Just checked my junk box there’s a lot of interfaces in the system
1 the rack and pinion are well clear in their respective spaces, but the bottom of the pinion grooves seem to be rounded and could be causing interference.
2 the universal joint has about 0.04mm slack
3 the worm shaft can move in and out due to clearance prob 0.04mm
4 fit between worm and wheel ? Can’t determine
5 the dog clutch between wheel and pinion shaft 0.25mm?
6 clearance between rack and pinion unknown but it must be there.
conclusion A lot of interfaces all of which need clearance to work or clever expensive engineering to eliminate all contributing to the backlash . This makes me even more certain a z feed screw of some type is the way forward and ditch the gas strut and spring system as I did I never lock the z , not a good idea anyway with cnc. I have to use light cuts , nothing like Jason in his blogs, but the results are excellent and well worth the effort of converting the machine
interesting. The rack is 25 wide. Why did they go to the expense of making the pinion gear 75 long? A bit of a waste the end could be reduced to below root dia and a bush inserted to reduce the hole diameter, or use a reduced hole..which to me seems cheaper. I wonder???
Edited By Zan on 05/03/2021 11:29:37
edit. Autotype errors
Edited By Zan on 05/03/2021 11:37:54
If your fine adjustment does nothing when adding cut, then the head drops 5 mm then the rack /pinion interface is strange,. Perhaps the pinion is moving in its bore The sx2 is a cheap light weight machine. Built to keep the costing down. When I converted mine to cnc I found that the z head dovetail casting was warped, probably from machining it when the casting was a bit green. It took a lot of work to get it so that with the column off the machine the head could slide up and down without any twisting. The test was done with a 3/4” silver steel bar in an R8 collet and the head was pushed along the column by hand. I can see that this could be a source of your problems as well.
I think the twisted casting was causing it to rock and this would be a course of the sticking. I found it by putting the head on the surface plate on the working face of the dovetail. From memory it I think needed about 15 thou packing under one corner to stop the rocking.
the idea that a ball screw nut will allow the head to fall is bunkum. The nut has to rotate for it to move! Fitting any z feed screw would solve the problem as you will have total feed control and sticking issues will be resolved unless there is serious clearance issues within the z slide arrangements as I had . Fitting a motor to any feed screw would make positioning impossible without the associated electronics and/or computer control. A hard wheel would do the trick nicely, so you end up with an arrangement as in one of the photos above and like the down feed arrangement on the Emco FB2 mill
I could never understand the original spring arrangement as the lever arm resulted in a change of upward force as the head is moved up and down all this and the z feed system was scrapped In my conversion which works very very well without any form of upward thrust. When jogging up and down with Mach 3 I need 1-4 x 0.01 increments in order to obtain a reversal of the head movement . This has not manifested itself as any problem while in use.
fit a full feed screw and dump all the z feed arrangements which I always considered to have too much lag and interface clearances to be effective. Your problems seem to confirm this
Edited By Zan on 05/03/2021 10:06:29
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