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Member postings for Perko7

Here is a list of all the postings Perko7 has made in our forums. Click on a thread name to jump to the thread.

Thread: Where to begin?
10/06/2019 08:08:43

I already have AutoCad 2016 which I use for 2D drafting but it also has a 3D component which I have seen others use quite competently at my previous employment (alas I had moved away from CAD work by that time). Does anyone in this forum use AutoCad 3D? I've tried a couple of simple things but did not get very far.

Thread: Horizontal Bandsaw - Final Thoughts
10/06/2019 08:04:35

To answer your second question, I have a horizontal bandsaw that can be used in the vertical position. The only issues I have found with doing this are 1) you will need to make a larger rest around the sawblade to support what you are cutting, 2) access to the blade is a little awkward as you have to lean across the remainder of the machine (this might be easier on a machine with a swivel head as you can turn it to 45 degrees making access easier), and 3) all the bits of swarf fall into some inaccessible parts of the machine needing a vacuum cleaner with a small nozzle to get them out. Other than that it seems to cut quite well in that position.

Thread: Quicksilver
04/06/2019 00:42:58

There are still a few mercury arc rectifiers in use at tramway and trolleybus museums around the world. Brisbane Tramway Museum has one with a glass chamber which is used every time they run. They used to leave the substation door open so visitors could see the glow from the glass chamber, not sure if they still do this.

Thread: Oh Dear, I've blown the chop saw...
26/05/2019 06:25:29

Before you consign the chop saw to the scrap-head, don't forget to retrieve all the useful bits (bearings, gears, shafts, and anything else that might come in *handy* one day). wink

Thread: What do YOU call it?
23/05/2019 13:29:13

Pottering or tinkering mainly, sometimes tidying up, occasionally playing and every now and then actually 'working' which usually means fixing something that is needed for other 'essential' household or yard chores.

Thread: Door knob collar
16/05/2019 11:11:44

Original probably stamped, but would metal spinning over a suitable former be a better solution? I know very little about it other than what I've read in some books but it seems like a possibility.

Thread: Chinese Lathes
09/05/2019 06:59:59

I would give my C6 a 5 out of 5 star rating

Edited By Jim Dobson 1 on 08/05/2019 01:27:18

I also have a Sieg C6 purchased new from Ausee at Christmas 2016 and have had very few problems and it has done everything asked of it. The only downsides compared with my other lathe (a 1929 3.5" Ideal) are the lack of back-gear, lack of a handwheel on the leadscrew, and lack of lever-locking tailstock but those are relatively minor disadvantages. As a similar self-taught (late in life) swarf-maker I'm more than happy with it.

Thread: What Did You Do Today 2019
27/04/2019 12:15:07

Finally got around to silver-soldering some steel components of my built-up coupling rods. Only chose this method due to lack of ready access to a milling machine to mill from solid.

Surprised how easy it was once I had sufficient heat. Ended up putting too much solder in some areas as it flashed through the gaps very quickly once melted so I was a bit unsure of whether there was enough to make a solid joint, hence added a bit more 'for good measure'. Turns out I shouldn't have.

Despite all advice about needing absolute cleanliness, managed to solder in solid some temporary spacers made from black mild steel that had only had the mill scale cleaned off with vinegar and were otherwise untouched. Seems like Tenacity flux works pretty well even on dirty steel.

Now to clean up, drill and ream holes for bushes and fit to loco. Will post some photos when they look decent enough.

Thread: Arc tangent to two ellipses
12/04/2019 07:12:04

Yes Ivan and JasonB, it is surface development like you have stated, I just couldn't remember the correct terminology.

Neil, I well remember the French Curves we used to use, never could get an exact fit but usually got close enough with a little angling of the pencil where necessary.

Instead of free-handing, we used to use a flexible rule which was a rubbery/plastic 1cm square rod about 40cm long with a soft metal wire of some kind through the core. When you set it to a curve it would just stay there until you straightened it.

Thread: Moving to Australia - Moving Workshop Machines
12/04/2019 07:02:16

As a lifetime resident, Brisbane is a great city to live in, relatively safe, relatively easy to get around but a bit spread out, a couple of reasonable model engineering resources, and a good climate most of the time (granted it can get a little steamy in summer, and our summer storms can be a bit frightening at first). Humidity effects on workshop equipment can be managed, usually it's your sweat that causes the most problem. Working outside in summer is possible as long as you have some shade and a couple of cold beverages to refresh yourself regularly. Skin cancer is a major risk in these regions so pale-skinned immigrants should quickly adopt the 'slip-slop-slap' sun-smart message. Nasties in summer are usually the mosquitos (mozzies in aussie language) and the midges or sand-flies (about 1/4 the size of mozzies but just as fierce).

Have not imported any equipment into Australia so can't comment on that aspect, but agree with others that good 2nd-hand machines of hobbyist size are pretty thin on the ground, so would recommend bringing yours with you. Main suppliers of new machines are Hare & Forbes, and Ausee who advertise on this site. There are a number of companies who deal in 2nd-hand machines but mostly industrial-size stuff.

Let me know when you get here, happy to show you around. I live about 30km to the west.

Thread: Arc tangent to two ellipses
11/04/2019 09:31:10

When I did my tech drawing training back in 1970, we were taught to draw it out in plan and elevation first, then draw construction lines at regular intervals perpendicular to the long axis which intersect the arcs. Then we could measure the offset and repeat that for drawing isometric or oblique views. The curve then became a freehand 'join the dot's as it rarely was a constant radius. Hope this helps.

Thread: Folding Bike design & build
11/04/2019 09:27:00

thumbs upthumbs up

Thread: Suitability of hot rolled steel for machining
05/04/2019 12:21:04

I'm also a regular user of hot-rolled steel either in rod or bar form. Never had any issues with deformation after machining. It is sometimes difficult to get a good finish, but I find HSS tools better than carbide for this purpose. Usually machine dry but an occasional squirt with tapping compound will help when deep drilling. Main issue I find is inclusions, as occasionally I'll come across a hard bit that defies all attempts to get a smooth surface. Only option is to part off into the bin and start again.

Thread: Long drills
03/04/2019 02:55:39

Or maybe just an extra-long screwdriver?? laugh

Thread: What Did You Do Today 2019
30/03/2019 10:33:15

Would not like to accidentally hit my leg with a strimmer having bicycle gear change cable instead of nylon cord!! Could result in a very nasty wound. Also the end tends to become frayed and 'unwound' so they do not cut as cleanly as a solid nylon cord.

Strimmers may be instruments of the devil Mark P but they do have very useful little engines and lots of lovely metal bits that can be re-purposed!

Thread: Fork and blade conrods
29/03/2019 07:57:01

I bit off-topic but I've seen this design once before, it was on a trophy presented to my father for his Morris Minor at a Morris Car Club rally in Queensland. The trophy was a polished timber base with a set of conrods mounted on it just like those in the OP photo. The conrods were clearly marked as coming from a Rolls Royce, presumably a V8. They were pretty solid. My guess it was designed that way to minimise vibration from offset conrods when the engine was running?

Thread: What Did You Do Today 2019
29/03/2019 07:43:45
Posted by Perko7 on 05/03/2019 08:25:20:

Made the other two buffer housings a couple of days ago, spent this afternoon making the blanks for the buffer heads from 50x50 squares of 10mm mild steel. Trimmed the corners to make roughly octagonal shapes, drilled and tapped M6 to mount on an arbor in the lathe, then started trimming to size. Interrupted cuts make lots of noise and the chips varied in colour from blue to bright red. Impressed by the resilience of HSS tools doing this, only had to re-sharpen once. Blanks were too hot to handle when done but the tool tip was not hot at all! Now need to re-mount on the arbor and turn to required profile before mounting on shanks (also threaded M6) with a smear of retention fluid.

Finished the buffer heads earlier this week and mounted them on the shanks. Also finished the housings and gave all a squirt with spray can of primer. Got some suitable springs this arvo from Bunnings and assembled the units, went to mount the first one on the headstocks and found I only had 7 x 5BA nuts so could only fit one buffer. Ordered some more so now have to wait until they arrive before I can finish that part of the job. Still, plenty of other things to work on....... laugh

img_5331rc.jpg

05/03/2019 08:25:20

Made the other two buffer housings a couple of days ago, spent this afternoon making the blanks for the buffer heads from 50x50 squares of 10mm mild steel. Trimmed the corners to make roughly octagonal shapes, drilled and tapped M6 to mount on an arbor in the lathe, then started trimming to size. Interrupted cuts make lots of noise and the chips varied in colour from blue to bright red. Impressed by the resilience of HSS tools doing this, only had to re-sharpen once. Blanks were too hot to handle when done but the tool tip was not hot at all! Now need to re-mount on the arbor and turn to required profile before mounting on shanks (also threaded M6) with a smear of retention fluid.

24/02/2019 10:16:45

Made two buffer housings today, machined from solid 25mm MS bar. Two more to go then i can start on the buffer heads, but tomorrow and Tuesday are both full up so will have to wait until Wednesday frown.

20/02/2019 10:00:20

Finally got some time abusing metal after several weeks filled with house renovations. Managed to make a start on the loco buffers by turning up the shanks. Once they are done I can turn my attention to the housings and then the buffer faces. Just need to find a lump of 50mm dia steel bar which I can slice up with the bandsaw.

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