Neil Youngberg “PROFESSIONal”

I’m not going to try to describe what this video is about except to say you may enjoy it if you like working with metal or tools.  I recommend watching it in full-screen if you can.  The cinematography is beautiful.

Heroic Mop Sacrifices Self to Save Grill on Memorial Day

"Here, the rescued charcoal grill once again stands tall, thanks to its newly donated and professionally fitted prosthetic leg. The grill appears fully ready and even eager for handling yet another full summer of seriously grilling many more delicious meals."

Reporting by Blabbermouth Bobblehead
DP – (Disassociated Press – No News At 11)

While pictures of the heroic rescue and salvage operation were unfortunately unavailable for publication, DP reporters were able to obtain exclusive images of the miraculously salvaged charcoal grill, which appears ready to stand tall through yet another summer of heavy cooking use and abuse thanks to its custom new prosthetic leg, shown below.  This leg used to be a mop handle, and was made available by the tired old mop, which had selflessly signed a permission slip authorizing medical authorities to use any such body parts as may be of use to help others when it passed away.  It died peacefully of old age in its sleep just as the need to use the grill arose, and so authorities wasted no time in putting together this rescue/salvage operation.

Both a 4×6 metal cutting bandsaw and an X2 mini-mill volunteered their services for this emergency grill rescue, although the X2 mini-mill humbly downplayed its part in this miraculous salvage operation, referring to itself as only being used as just a “precision drill press” in the resuscitation efforts.  The 4×6 bandsaw offered no comment, preferring to stand quietly in its corner of the garage, out of all the hubbub and excitement, just waiting to cut something, anything, hopefully soon.

The 4×6 bandsaw cut the metal tubing mop handle to length, and the rubber handle end was cut down just a bit to remove the hole in the end that was previously used to hang the mop up on a hook on the wall.  This was deemed to be too structurally weak for grill leg duty and so was simply removed, leaving the remaining rubber handle to act as a foot.

Here some of the details of the X2 mini-mill’s efforts can be seen, with 3 pretty close to identical sheet metal screws being dug out from a scrap box and used to attach the prosthetic leg inside the top mounting end of the grill’s original leg. Three screws spaced roughly equidistantly apart now hold it securely in place:
And of course, the former rubber mop handle is shown now doing duty as a grill foot.  Note the surgical marker pen line showing roughly where to drill the hole for the grill rack, at about so-ish an angle, like so:
The grill’s owners were unavailable for comment, with a family spokesman only commenting that the grill had already BBQ’d up 5 delicious steaks and a full pack of hot dogs, and the family was presently engaged in enjoying their Memorial Day meal.

Further investigation by this reporter revealed that it is common for grills of this type to rust away and weaken at the spot near the base of their legs where they are drilled through for the bottom grill rack to mount into.  What eventually happens is this spot rusts, weakens, and finally the bottom of the leg breaks off.  This makes the grill become prone to falling over and unsafe for further use. Often such afflicted grills are retired and salvaged out to metal recycling plants.

Thanks to the selfless gift of life from the now dearly departed old mop, and of course the tireless and skilled efforts of the 4×6 bandsaw and X2 mini-mill, there is at least one charcoal grill that is not going to go out that way just quite yet.  Lots of life to live and grilling to give left in this old beast, for at least another long hot summer, maybe two.

DP – Disassociated Press. All Rights Reserved.

John Z. can be found offering excellent advice in a number of machining and metalworking discussion groups. – Editor

Modifying a Craftsman 2 X 42-inch Belt Sander For Tool Grinding

The Craftsman 2 X 42-inch belt sander is a very good general purpose belt sander.  With its 1/2 HP motor it can handle most light duty work in the shop, including grinding lathe tools for both metal and wood lathes.  This grinder allows for very fast belt changes, tracks well with a simple adjustment and has enough power to grind tools without overheating or bogging down.  However, it does have two deficiencies that must be addressed before any serious grinding can be done on it — the main grinding table and the platen.

The OEM table is made of cast aluminum.  It pivots on and locks with a single large screw.  Firm pressure on the table can overcome this screw and the table will move with the belt running, which is very dangerous.  My advice is to dump it and build a decent table.

The OEM platen is stamped mild steel.  It is okay for light use like shaping Popsicle sticks but will not last long grinding lathe tools.  The platen is mounted solidly to the chassis and is fairly stiff but pressure on the belt will wear a divot into it quickly so basically it’s useless once this happens.

Resolving these deficiencies isn’t difficult but it requires some fabrication.  I’ll show you how I addressed them.

The Platen Fix

A grinder platen has to be solid and unyielding, flat and ideally long wearing despite driving a grinding belt and grit over its surface.  No steel platen I know of will withstand this kind of abuse for long but a ceramic glass liner will.  This liner is actually a high temperature glass material originally developed by Corning and is commonly sold by knife making suppliers in 2-inch wide X 1/4-inch thick slabs of varying lengths.  Commonly known as Pyroceram, it is usually mounted to a steel backing plate with JB Weld.  This stuff is highly wear and heat resistant and only a full-time knife maker is likely to ever wear one out.  If you do no other mods to your grinder at least do this one.

I used a 2-inch wide X 9-inch long X 1/4-inch thick piece of O-1 precision ground steel as a platen/backing plate because I wanted a flat mounting surface that would not move with heat over time.  I know that mild steel can move with localized heat and while this may not break the epoxy bond … it might.  So far, I have had no separation issues so this worked for me.

I drilled and tapped two 1/4-20 holes on each edge so the platen can be flipped over if the liner ever wears on one end.  A piece of 1/8-inch thick X 1.5-inch wide angle iron (not aluminum) is used to attach this backing piece to the side of the chassis using the OEM screws and platen mounting holes.  The mounting holes in the angle iron are slotted to allow squaring of the platen to the belt.  Offset your platen and chassis screws if you copy this; the way I did it works but it would be better if the screws were clear of each other.

Before attaching the liner to the platen, be sure to lightly bevel or round the side edges of the liner and more generously round the top and bottom edges to prevent cutting the belt.  This is best done on a slack 50-60 grit belt.  The sparks will be orange and the glass will glow but it grinds easily enough.  I also lightly sanded the side of the glass that would bed in epoxy using sandpaper overlying some plate glass to give the glass some tooth.

I put some oil on the tip of some 1/4-inch screws and use nuts to lock them down with their ends just flush with the epoxy side of the steel platen.  This is to keep the holes clear of epoxy.  After cleaning both contact surfaces with lacquer thinner, a 2 X 9 X 1/4-inch piece of Pyroceram is bedded onto the face of the platen with an even layer of JB Weld.  I covered the face of the glass with a thin piece of plywood and clamped it with 4 spring clamps and allowed it to dry for a full 24 hours.  JB Weld has the highest heat tolerance of any commonly available epoxy, at least to my knowledge.  Ideally, you want to have a ledge under the glass liner to keep it from being knocked loose but mine has been stable for many years without a ledge.  Be sure to use blue Loc-Tite to attach the platen to the grinder chassis so it won’t vibrate loose but can be easily removed if needed.

In use, the Pyroceram platen is used like any other platen.  Since it is glass you should avoid slamming hard objects into it but otherwise it is tougher than nails.  I have ground hardened steels, tools, and other assorted materials and have yet to see any indication of wear or movement over the years, though the picture shows some transfer of paint from the back of the belt.  Pyroceram is some truly amazing stuff.  The piece I used cost $20.00, delivered!

The Table Fix
Continue reading → Modifying a Craftsman 2 X 42-inch Belt Sander For Tool Grinding

Make Your Own Machinable Wax

Make Your Own Machinable Wax

For those of you who aren’t familiar with or don’t want to pay for machinable wax, this article on what it is and how you can easily make your own if you want to make your own should come in handy.

Some things about machinable wax

  • It can be a cheaper and better alternative to metal, making it ideal for when you create your prototypes. One member from the MadModder community made a prototype of a dry sump unit for his BMW V8 using machinable wax, which saved him from using his expensive metal.
The Machinable Wax Slab, Early Stage

He starts with a fairly basic (and fairly large) piece of machinable wax. (Photo courtesy of MadModder member, AdeV)

  • Machinable wax won’t damage your cutters or CNC machines. It also won’t cut fingers, which might be good if you’re teaching kids or giving a demo
  • It’s recyclable, meaning you can keep re-melting broken pieces and shards
  • You can make your own with inexpensive and easy to find materials

Since machinable wax costs anywhere from 12 to 350 (usually for industrial-sized quantities) dollars, taking some time to make your own will save you a few bucks.

What you need

  • Paraffin (candle) wax. This can be bought at many arts and crafts stores
  • Items made from LDPE plastic. Things like plastic bags and milk jugs work, but there’s a more comprehensive list is on The Home Shop Machinist & Machinist’s Workshop Magazine forum
  • Something to boil the ingredients in safely, like a double boiler or an electric fryer you can use outdoors

You’ll notice that the ingredients and equipment listed is easy to find or readily available. A few machinist forums and groups offer different variations of the recipe, but of all of them, the MadModder forum gives the best instructions. The Weaponeer forum also has a pretty decent recipe in PDF format.

Safety precautions

There are a few things that need to be kept in mind before performing this task:

  • You’ll be working with high temperatures and wax, which can cause serious personal injury or property damage. The 7×12 Mini Lathe group offers an interesting discussion on some excellent safety tips so you don’t hurt yourself or burn your house down

Take it as seriously as you would with any aspect of machining.

Whichever recipe you choose, it may take a couple of tries before you get the perfect wax, but once you get to that point, you’ll be saving money and making your own machinable wax in no time.

Continue reading → Make Your Own Machinable Wax