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  1. jscpm

    Cylindrical pillow block bearing housings do not exist?

    I am trying to obtain a pillow block housing for a tapered roller bearing with a 62mm outer diameter. Normally, for a spherical bearing, this would be a type P206 housing. The outer race of a tapered roller bearing, however, is cylindrical, not spherical, so it will not go in to a P206 housing...
  2. jscpm

    OT: How to make a wagon with a flexible suspension

    I want to mount the axle for a wagon in such a way that it can flex, like the "trucks" on a skateboard. I don't need it to have a full spring suspension, just a little give so one axel can tilt one way while the other is tilting the other way. Assuming I using pillow blocks to mount the axle...
  3. jscpm

    Sourcing smaller bearing housings?

    I am having a hard time sourcing smaller bearing housings. I have a 30mm shaft that I want to use tapered roller bearings on with a split plummer block housing, but both SKF and Dodge reps are telling me that they do not sell ones that small. What are my options?
  4. jscpm

    Recommendations for imperial / SAE ball screws / linear motion stages?

    Does anybody have a recommendation for a company that supplies high quality imperial / SAE ball screws / linear motion stages? This is for machining applications.
  5. jscpm

    Design for a small, adjustable knee for tool holding?

    I need a product or design for a small knee that can be used for holding a tool or small workpieces. It will be mounted on a linear drive and should be about 4" square and 3-5" tall or so with a throw of about 1-2". I have seen various designs over the years. For example, there is that...
  6. jscpm

    Diametral pitch seems to be irregular

    We have an older arbor press that we want to make a new (better fitting) pinion for and when we measure the rack we keep coming up with a diametral pitch of 7.25 Are we probably going wrong somewhere or should we expect that it is typical for arbor presses to have irregular gearing?
  7. jscpm

    Flexible, powerful benchtop machining setup using a baseplate

    I thought the readers here might be interested in seeing a machining setup I constructed recently using a heavy duty optical baseplate. This kind of setup allows me to get a very good power to size ratio. In the configuration shown in the photo below we are grinding a precision bevel on die...
  8. jscpm

    High quality lacquer finishes for metal work?

    Any recommendation for high-quality pigmented lacquer finishes for metalwork? From what I understand the solvent based acrylics are the highest quality option (except for exotic processes like urushi). However, it is hard for me to identify suppliers and tell the difference between what is high...
  9. jscpm

    Recommended materials for dowel pins

    I typically get dowel pins in 4140, but notice that they are commonly available in other materials like M2, 416 and 17-4 PH. Is there any particular reason why I would prefer these other materials?
  10. jscpm

    Is it mechanically possible for a Sig Sauer P320 to discharge without the trigger being pulled?

    I notice that Sig Sauer, a manufacturer located near me, is getting sued because people are saying their P320 handgun has a tendency to fire spontaneously--without the trigger being pulled. I am not familiar with the firing mechanism used in such guns, so I am wondering if, from a mechical...
  11. jscpm

    Problems brazing steel: joint keeps breaking

    I have a man attempting to braze a steel joint and he is repeatedly failing at it. He has some experience welding but this is his first experience brazing. The joint is two pieces of A36 low carbon steel that are cut from a flat 3/8" thick and 4" wide and are being butt joined at an angle. So...
  12. jscpm

    Staples lower quality than formerly?

    This is going to sound really paranoid, but are staples lower quality than they used to be? I have recently within the last couple of years had a hard time stapling papers. The staples tend to not penetrate the paper and jam up. I use Swingline "Premium" staples. If this is what they consider...
  13. jscpm

    Recommendations for spring coiling machine?

    Does anybody have experience with spring coiling machines? I am looking for a small 3-axis machine and there are quite a lot of different manufacturers and it is hard for me to evaluate them.
  14. jscpm

    Micron accuracy linear motion over short distance?

    I have an application where I need linear motion over a short distance with micron level accuracy. So, ideally the stage would move in increments of about 0.00005" and have a range of at least around 0.002" so about 40 steps altogether, although 100 steps would be nicer. It can be manual, does...
  15. jscpm

    How have you built a base for you granite reference surface?

    I am thinking of moving up to one of those big 1000-pounder granite reference surfaces, AA grade, and wondering what the right strategy is for creating a base for it. How have you done it? One shop I saw appeared to be using a concrete base, but it was not clear what the contact points were. I...
  16. jscpm

    Useful to reduce jig clearance when reaming?

    Normally I have about 1/4" clearance gap between a jig plate and the work to allow for chips, more or less depending on the hole size. Recently I saw a presentation by a guy who was recommending reducing or eliminating that clearance during subsequent reaming and he was saying that it increased...
  17. jscpm

    Why did jig grinders replace jig borers?

    I never quite understood why jig grinders replaced jig borers. Grinders definitely generate more heat, which is bad. I guess the borer does not have the problem that you have to deal with cutting tool geometry. And you can do outside diameters.
  18. jscpm

    Dividing head for $299

    Ok, now I have seen it all, a $299 dividing head. If you order now, they will include a set of six steak knives. No need to be paying $5,000 for dividing heads anymore. See, normally, just the forged gear steel in this would cost $300 alone, but their secret is that they don't use steel. It's...
  19. jscpm

    Recommendations for mu-checkers?

    Any recommendations for mu-checkers? I am only familiar with the old B&S 1020 and 1021 which apparently is no longer being made. The "replacement" Tesa displays seem a lot more cheaply made and less convenient. There is no coarse-fine adjustment on the Tesa units, for example, and the scale is...
  20. jscpm

    Mounting larger diameter chucking reamers

    What is the recommended method of mounting and using chucking reamers with shafts over 0.5" in a lathe? I know the idea of the long shaft of the reamer is to allow it to bend to follow the hole, but there must be a better way of setting it up so it floats.
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