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  1. M

    Post your random questions about welding

    Here is another oddball tidbit about welding. Nearly all of my experience pertains to ASME pressure welds on boiler tubes. In the past people have broken the flux off of a stick welding electrode to use as a TIG filler material. On low alloy electrodes like E7018, this can work, but as the...
  2. M

    Delta drill press restoration.

    For the return spring you can go ahead and take it apart. The return spring housing should have threads cut into the body that mate with a bolt in the head casting. This bolt interacts with the threads and should make rewinding the spring in place an easy job. I restored one almost just like...
  3. M

    What gets welded at 800 amps?

    Using submerged arc strip cladding, the filler is not limited to round wire, but instead can be wide strips of material. This can easily be used to add a cladding of inconel, chemical, or wear resistant material to steel, sometimes in "beads" 2-3 inches wide. This used a tremendous amount of...
  4. M

    Blackhawk S-4 Restoration

    For the chevron seals on the main ram, the seals are preloaded independently of the rubber packings. The ram stop ring is threaded and is designed with 4 pin holes in the face used to tighten the stop ring against the chevron packings. After they are loaded, the packing rings can be installed...
  5. M

    Blackhawk S-4 Restoration

    After a brief pause on this project for the birth of our 3rd child, I was able to get back to work actually assembling the hydraulic unit. For the most part all of the parts only required cleaning without any real repairs aside from polishing every moving/sliding component. While starting the...
  6. M

    Figgering out Rectangular Tubing ID & OD

    Search on McMaster Carr for "Telescoping Weld-Together Rails. https://www.mcmaster.com/weld-together-framing/telescoping-weld-together-rails/?SrchEntryWebPart_InpBox=telespar+tubing They have a selection of tubing both round and square sized to slide in each other. I have used on projects...
  7. M

    Blackhawk S-4 Restoration

    Here is what I measured so far on my jack, all the dimensions are based off the bore and cylinder measurements. Bear in mind there are some variations in the seal configurations on these, so you best bet would still be to take yours apart and cross reference dimensions. Also, I am not sure of...
  8. M

    Blackhawk S-4 Restoration

    That was kind of what I had in mind. I need to find some bit of material, preferable plastic that is large enough to slip over the ram and drill two small holes and place pins in it. The picture below shows the ram packings better. There metal piece in between the V packings and ring packings...
  9. M

    Blackhawk S-4 Restoration

    I am still confused by the pictures, I and some others can see them fine. I checked them on my work computer and it was like you described, not even a broken link or image symbol, just nothing. The pictures that you could not see, showed the packing arrangement, but no dimensions. I can try...
  10. M

    Blackhawk S-4 Restoration

    With all of the packings and seals removed from the hydraulic unit, there is no wonder the seal kits on these jacks are so expensive. There are so many sealing elements, but I guess the proof is that a 60+ year old jack was not leaking. I was terrified of not getting the packings back in the...
  11. M

    Blackhawk S-4 Restoration

    Odd, I can see the pictures from two different computers I checked it on. I wonder if anyone else can see them? Moving onto the hydraulic unit, I wanted to figure out the function of all the various ports and ball checks in the unit. The original paperwork was a big help, but some of the ports...
  12. M

    Blackhawk S-4 Restoration

    It has been a long time since I have checked back in with this thread I started. Ever since I bought this S-4 jack, I had always owned a "cheap" aluminum racing jack. That was a purchase I made when I was young and did not know much better, but it was always frustrating to me. I could not...
  13. M

    Looking for review of Ironclad heat-resistant glove

    I use the ironclad loves in question at work. They are not used for welding, but for doing slag inspections on industrial boilers. The inspection doors are typically quite hot, but the real kicker is the radiant heat once the doors are open. I think the gloves do much better than standard...
  14. M

    drilling through this s-binder so dam hard

    I shot an s biner today with our material analyzer. It registered as 410 stainless steel, which is a martensitic grain structure stainless steel. This type of stainless can be hardened by quenching, unlike the 3xx series of austenitic stainless steels. I checked it with an impact harness tester...
  15. M

    carbon fiber

    I am not positive about carbon fiber, but for many composite materials like fiberglass and G-10 garrolite, water jet can be problematic. All the times I have tried garrolite, the water jet works great for parts of the cut, but will then de-laminate and bubble up the composite in other portions...
  16. M

    W10x25.4 Beam Capacity

    Doing a set of quick calculations assuming a maximum allowable bending stress of 12ksi (3x factor of safety based off standard A36 structural steel,) give a load capacity of about 6900 lbs at 16' span and 3700 lbs at a 30' span. That being said, for long spans, especially the 30' I would never...
  17. M

    Show us your VFD conversions/installations

    That line filter was a last ditch effort to try to prevent the setup from tripping the GFCI, unfortunately it did not work, but I never got around to removing it from the system. The only way I found to keep the GFCI from tripping was to run a circuit to the drill press without a GFCI.
  18. M

    Show us your VFD conversions/installations

    There are some rules of thumb regarding enclosure volume and material vs the VFD size. With mine mounted in a steel enclosure with 4 times the volume of the VFD should be close to being able to cool on its own without fans. My installation is "sealed" and so far I have had no issues, but I...
  19. M

    Maintenance Free Big Green Egg Table

    After completing the frame, I started in on the wood work portion of the project. For the table I built last year, the Ipe wood was simply sitting on lips on each end of the table, with no means of fastening the boards. While this is nice and simple and quite effective, a few of the boards...
  20. M

    Maintenance Free Big Green Egg Table

    They are well worth the investment. If I had spacer for a bigger saw, I would have gone that route, but options for mitering saws get expensive quite quickly.
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