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Thread: Table Mounted Jigsaw
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9th June 2020, 11:34 AM #16.
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This is a really good move. FWIW my experience is that not all stainless is completely rust proof and there are several things I have made in my shed out of stainless that eventually have rusted. Two examples are the steel straps I used to hold up some of my DC ducting and some stainless sheet that I used to make a mini-metal cutting table saw. Anyway lets see what happens. I think some wood resins don't play all that well with some types of stainless.
I am interested by your bluing process. I had always thought this was achieved by heating boiled linseed oil onto a surface.
I had thought it was used on the splines for back saws. Have I got this wrong or are there two processes which have a similar description? I get the impression your bluing (nothing to do with intense discussions with SWMBO) could also be described as fuming (still nothing to do with domestic disputes ).
This is the brake handle I made for my De Prony Horsepower measuring rig. The handle is just mild steel.
As its handle it gets handled but it shows how little has work off after about 4 years use.
Brake-handle.jpg
Have also used the much quicker Hydrogen peroxide and salt method but I don't think the results are as good as the fume bluing. Its OK for basic stuff.
There's WIP for that further along in the same thread I've linked to below.
I have posted a detailed recipe of the fume method in the MW forums here
More metal bluing
Were the hold downs a proprietary device? They look a little too "cast" to be shop made.
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9th June 2020 11:34 AM # ADSGoogle Adsense Advertisement
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9th June 2020, 01:32 PM #17
Thanks Bob for such a comprehensive reply. I will look into all of your suggestions as it is an interesting subject.
Stainless steel is an interesting material. Generally it is regarded as non magnetic and this is the big giveaway until you start cutting and grinding and can see the different style of sparks and experience some difficulty with the likes of drilling. However, a little like, carbon steels, there are a multitude of types and I have no idea what I have.
The chromium content of stainless gives the resistance to rusting. I believe it varies between 11% and 18%, which would explain why some stainless steel can develope mild rusting.
The one that intrigues me is stainless cutlery. The knives are magnetic but forks are not. I think the level of nickel influences the degree of magnetism. Also some stainless is magnetic in the annealed state but not once pressed or formed.
It is a big subject, which I should not delve too far into here. Suffice to say the metal I am working with is stainless steel.
Regards
PaulBushmiller;
"Power tends to corrupt. Absolute power corrupts, absolutely!"
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9th June 2020, 01:39 PM #18Bushmiller;
"Power tends to corrupt. Absolute power corrupts, absolutely!"
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9th June 2020, 10:29 PM #19
Well, as I hinted in the previous post, the day did not go according to plan. In fact it was very frustrating. It started off well as I realised the aluminium table had a threaded hole in just about the right place for a piece of flat bar to mount the support arm. Initially I thought it was metric but this was not the case. It was 3/8" imperial and as luck would have it I had a set of three taps for that thread. I drilled the hole and inserted the first tap. Initially it went well but the shallow tap was not threading cleanly. I sped up the drill, it started to bite in and then jammed: No matter. Pull up the drill so reverse is automatically selected which I did and it snapped off the tap at plate level.
P1060118 (Medium).JPG
Try as I might I could not budge that tap. I drilled around it, I tried to grab it with vice grips, I tried to turn it anti-clockwise using a punch, I drilled out the hole larger from the underside and tried punching it though. I broke three small twist bits, bent two punches and broke one punch. Got nowhere. Time to drill another hole. I did that and tapped it easily with the hand tap. That was after about two hours of cursing.
P1060119 (Medium).JPG
Then I bent up the beam that will extend out to the jigsaw blade and give support via bearings. I ground a small bevel on the edges for a weld profile.
P1060120 (Medium).JPG
I mentioned earlier that the welding was going to create an awful mess. It did and when the plastic catches fire it stinks too. The additional problem was that my auto darkening welding helmet, which was admittedly on the blink (almost literally), decided it was not going to play ball. It would only go to dark mode. Without a flip up front lens I could not see what I was doing. That really makes welding difficult!
P1060121 (Medium).JPGP1060123 (Medium).JPG
The weld will probably clean up well enough, but the plastic cannot be smoothed with power tools as it heats up and "curdles. " Sorry to show both sides. I just thought you would like to see that they are equally ugly, for the moment at any rate!
I have also cut some timber to use as an infil, but I am still working on that. I also will have to buy some small bearings as the smallish bearings I have are going to be too large. It really needs bearings the size that are commonly associated with router bits. About 12mm OD should be about right for the bearings either side of the blade. A slightly larger bearing can be used for the one behind the blade.
I won't be getting too much done for a few days now as I am back at work. Hopefully next week will be better.
Regards
PaulBushmiller;
"Power tends to corrupt. Absolute power corrupts, absolutely!"
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19th June 2020, 06:46 PM #20
The new welding helmet arrived today and I was able to secure the support arm to a piece of flat bar that in turn is screwed to the table:
P1060127 (Medium).JPG
The previous welding was cleaned up and you can see the extra hole where I broke off the tap. That will have to be filled either with weld or maybe bog .
P1060128 (Medium).JPG
and this timber will be used to infil the chanel and also provide something easy to fix the adjustable bearings.
P1060129 (Medium).JPG
Apologies. It's a slow job. Other stuff keeps getting in the way.
Regards
PaulBushmiller;
"Power tends to corrupt. Absolute power corrupts, absolutely!"
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19th June 2020, 07:35 PM #21
Paul some progress,is better than no progress,
How will the top of the blade be held,guided.
Will you be able to insert the blade easily?.
Looking forward to hearing it roar.
Or maybe just a nice light machine noise would be nice.
Cheers Matt
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19th June 2020, 09:40 PM #22
Are you going to build a guide assembly similar to that used on a bandsaw? And just as rigid? That would certainly help reduce the blade wandering off at an angle like my old Triton jigsaw attachment thingy was prone to doing.
Nothing succeeds like a budgie without a beak.
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20th June 2020, 12:18 AM #23
The quick answer to both Simplicity and The Chief is "yes." Similar to guide bearings on a bandsaw. I have just got home from a wild night Friday night party: Actually Friday is the only real part of that statement and have received a notification that my bearings from China have been cancelled as they are "out of stock."
If I was a cynical person I would say I was a casualty of the Aussie/Chinese conflict. Consequently I will go down in the anals of history with the demise of the beef trade, the cessation of the barley exports, the execution of an Aussie citizen for political purpose and the embargo on small quantities (5) of bearings.
Regards
PaulBushmiller;
"Power tends to corrupt. Absolute power corrupts, absolutely!"
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20th June 2020, 08:56 AM #24
If I was a cynical person I would say I was a casualty of the Aussie/Chinese conflict. Consequently I will go down in the anals of history with the demise of the beef trade, the cessation of the barley exports, the execution of an Aussie citizen for political purpose and the embargo on small quantities (5) of bearings.
Welcome to the Brave new world brought too you by the Chinese communist party.
Maybe a review of 1984 an Animal farm.
Cheers Matt
Surely you can get some bearing closer to home Paul.
Regards
Paul[/QUOTE]
Sent from my iPhone using Tapatalk Pro
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20th June 2020, 07:28 PM #25
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20th June 2020, 08:35 PM #26
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20th June 2020, 08:36 PM #27
No, you are a little wide of the mark, CT. Bushie is obviously an innocent victim of the deviant autocorrect "service".
Annal is defined in the Oxford English Dictionary as a "concise historial record in chronological order...". That word probably does not appear in Mr Webster's abomination, which is so anal about so many topics.
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20th June 2020, 08:48 PM #28
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20th June 2020, 08:53 PM #29
Sent from my iPhone using Tapatalk Pro[/QUOTE]
Matt
I was being lazy. I guess it serves me right for not buying locally. I will call in at one of the bearing specialists in Toowoomba next time I go there. On the subject of China what did we expect? Taunt a tiger and be prepared to be scratched! Only a problem if you mind being scratched.
Regards
PaulBushmiller;
"Power tends to corrupt. Absolute power corrupts, absolutely!"
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20th June 2020, 11:19 PM #30
Matt
I was being lazy. I guess it serves me right for not buying locally. I will call in at one of the bearing specialists in Toowoomba next time I go there. On the subject of China what did we expect? Taunt a tiger and be prepared to be scratched! Only a problem if you mind being scratched.
Regards
Paul[/QUOTE]
An remember Paul,
All saws are equal and some are more equal than others,
I think that’s true for bearings too [emoji6].
Cheers Matt
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