Blast room

[TorontoBuilder]

So, I thought that this project was on hold until spring.

Last night our friend Dave from Guelph stopped by my brother's. They got to talking about this project and Dave said he wanted to get this done this fall. They decided that my lathe needed to go to Guelph again to be sand blasted this fall too.

So today instead of moving it a few kilometers it became much more involved, and sketchy. Wheeled the lathe out of the garage on pallet truck. Lifted enough to remove pallet.

Cleared everything out of the way except the crane and the lathe.

Hoisted the lathe. Without the motor, motor mount and variator it was unbalanced a bit towards the tailstock end but not so much a person leaving in towards the lathe couldn't push it level. Once up 6" the lathe was spun 180 degrees to put the headstock in front of the axle to balance the load in the trailer. Then hoisted to 6" above the trailer deck, dropped pallet into trailer.

Backed trailer into position. Lowered lathe, and strapped it down.

The binding straps pass thru holes in the bed and go to the front and the rear of the trailer. It can't move at all. Put crane into trailer and secured it separately, put the loose lathe parts into the back of the SUV and away we went. 90 kph to Guelph...

In Guelph we had no driveway, so had to lay down boards to be able to move the pallet truck. This is just after I pulled the trailer ahead and Dave and Tom were spinning the lathe to align with the pallet. They seem so unconcerned even after I told them a dozen times I was a little worried about that strap. It is old

Now it is all tucked away in the wood shed. Not really a shed but what else can you call it? Next move only requires a pallet truck

 

[quitereal]

That gantry sure would be handy. Are you pulling the tags and such? Masking a bunch of stuff? Is there a 7/8 threaded hole in the bed on those for an eyebolt?

 

[TorontoBuilder]

That gantry sure would be handy. Are you pulling the tags and such? Masking a bunch of stuff? Is there a 7/8 threaded hole in the bed on those for an eyebolt?

Yep that gantry has been handy as hell.

yep I'm pulling every plate and tag on every machine we're sand blasting.

There is a hole thru the bed, I prefer to push my strapping through it and lift with that. But I am only lifting about 900 pounds

 

[phaxtris]

You have a lot of faith in that very thin (thickness, not width) black strap running over all those sharp corners

 

[TorontoBuilder]

You have a lot of faith in that very thin (thickness, not width) black strap running over all those sharp corners

There were not really any sharp edges, and it is doubled up 1" tubular webbing with a tensile strength of 4000 pounds.

 

[phaxtris]

There were not really any sharp edges, and it is doubled up 1" tubular webbing with a tensile strength of 4000 pounds.

What you normally consider a sharp corner and what a sharp corner to a strap is are not the same, the rack and the corner of the ways would be a sharp corner, especially for a skinny piece of webbing

When a strap gets overloaded on a corner and a cut starts it goes. Like right now. I would hate to hear about that lathe hitting the ground

How do I know this ? Because I have overloaded straps on a corner, one comes to mind with 2 brand new 20k rated endless loop lifting straps and a bundle of plate weighing 4000lbs, with carpet softeners, yea that shit made it about 4ft in the air before it sliced through the straps and slammed back down....20k rated lifting straps have a breaking strength of 80k....so 160k worth of capacity broken with 4k

I will post a pic tomorrow of an actual 4000lb rated lifting strap....you will see the difference,

 

[TorontoBuilder]

What you normally consider a sharp corner and what a sharp corner to a strap is are not the same, the rack and the corner of the ways would be a sharp corner, especially for a skinny piece of webbing

When a strap gets overloaded on a corner and a cut starts it goes. Like right now. I would hate to hear about that lathe hitting the ground

How do I know this ? Because I have overloaded straps on a corner, one comes to mind with 2 brand new 20k rated endless loop lifting straps and a bundle of plate weighing 4000lbs, with carpet softeners, yea that shit made it about 4ft in the air before it sliced through the straps and slammed back down....20k rated lifting straps have a breaking strength of 80k....so 160k worth of capacity broken with 4k

I will post a pic tomorrow of an actual 4000lb rated lifting strap....you will see the difference,

I was a serious climb and caver for 20 years with tons of experience rigging big drops and traverse lines around very sharp rocks.

Next time I am at my lathe I'll take pics to show there the webbing does not pass over sharp corners at the ways.

and again, it is not a skinny piece of flat weak webbing, it is high tensile strength tubular nylon webbing doubled up

 

[phaxtris]

In the photo is appears you can see the indentation of some of the rack teeth through the webbing, and it is clearly going over the bottom edge of the front ways, which is definitely sharp enough to cut into the webbing, and given its single ply if it cuts enough that whole strap will rip in half

The WLL of that strap if it were rated for hoisting would be at most 1333lbs, so in a basket it's kind of light, but still plenty, the problem is how thin it is, how much of a cut would it take to get through 50% of the straps thickness ? Not much

I will grab a 2T rated hoisting strap from my truck in the morning, it is significantly thicker, because yes the breaking strength is much higher (12000-16000), but also it allows the strap to withstand some damage while still supporting the rated capacity....say if the strap were to slip and get an abrasion cut through 50% it would still carry the load (albeit it would be garbage after that)

There is more to selecting rigging than just capacity

Ok then, here is my relevant experience when it comes to hoisting and rigging.....

I've been a field welder and ironworker for 20 years, commercial construction as well as industrial shut downs, I have probably rigged and made more picks in a single day than most of the members here have in there entire lives, I did my first rigging course 19 years ago, and have had countless "letters of competency" sent out on my behalf as a rigger in the years since

 

[skippyelwell]

Back to your blasting shed, you might think about rubber pond liner, 1-1.5mm thick for your interior walls.
Usually goes on sale at the end of the season at Sheridan's Nurserys as they try to reduce stock for the winter months.
I've built a couple of sand blast cabinets out of plywood and pond liner and it works well resisting abrasion.
Love the Colchester, hoping you post some pics of the restoration.

 

[Dan Dubeau]

Check out Vevor for pond liner. It's cheaper than actual pond liner, that's because it makes a terrible pond liner. It might actually be better suited for a blasting backdrop.

 

[Susquatch]

Yep that gantry has been handy as hell.

Nice. I assume you broke down and bought one...... Looks a lot like my converted marine boat lift.

To my eyes, that web looks good. But it's the kind of thing you have to see with the naked eye. Pictures lie - both ways!

I'm a bit surprised it's tail heavy. I would have thought that the headstock would have tipped the scale the other way! Is the tailstock still on it?

What the hell is this? Looks like a lifting peg.......



FWIW, I love the wood shed. I think I could live in there!

 

[CWret]

Above was mentioned (@Dan Dubeau & @skippyelwell) using a pool liner for blasting protection on the walls. I like that idea - but they are black and suck up any reflective light. I bought a HD plastic tarp (see link) to use as a curtain around the mill (chip containment). That project is still on the to-do list. These tarps would be easy to hang on the walls and easy to remove when not needed.

Amazon.ca

 

[TorontoBuilder]

Nice. I assume you broke down and bought one...... Looks a lot like my converted marine boat lift.

To my eyes, that web looks good. But it's the kind of thing you have to see with the naked eye. Pictures lie - both ways!

I'm a bit surprised it's tail heavy. I would have thought that the headstock would have tipped the scale the other way! Is the tailstock still on it?

What the hell is this? Looks like a lifting peg.......

View attachment 53791

FWIW, I love the wood shed. I think I could live in there!

That handle slides in and out for gear selection.

The webbing has been used for this purpose 5 times and has been inspected after each lift when it was out away and there isn't a single scuff on it. I'm more worried about any grit that the webbing picks up when I push it thru the hole. It does not touch the rack teeth at all and the lower edge of the ways are dull and rounded.

Remember Colchester selected that balance point based both a big ass motor and a very heavy variator being installed at the extreme end of the headstock. I'm surprised that it was not even more unbalanced.

I'm no fool, I have the tailstock stored away in my house. I'm considering a gun safe to keep it even more secure until the weekend we start sandblasting. Which reminds me, I need to remember my steady and follow rests as well.

 

[TorontoBuilder]

Above was mentioned (@Dan Dubeau & @skippyelwell) using a pool liner for blasting protection on the walls. I like that idea - but they are black and suck up any reflective light. I bought a HD plastic tarp (see link) to use as a curtain around the mill (chip containment). That project is still on the to-do list. These tarps would be easy to hang on the walls and easy to remove when not needed.

Amazon.ca

Thanks to @Dan Dubeau and @skippyelwell for their comments, and you CW because I'd thought about what to use and almost bought heavy floor mats. That would have been expensive and not as useful.

I think I can find a compromise if I check with a couple of commercial builders I know, they use a elastomeric roll roofing with a white layer on the exterior. They may have some scrap pieces to try

 

[Susquatch]

I'm no fool, I have the tailstock stored away in my house. I'm considering a gun safe to keep it even more secure until the weekend we start sandblasting.

I think you have cracked the missing tailstock riddle......

I used to think it was cronic filing that caused the shortage of tailstock. But I'm realizing it's really unintended consequences causing all this chaos.

Assuming both pilers and filers hide their tailstock to stop theft, then die, their spouses would all sell the lathe without a tailstock. That's prolly how/why we get drowned in lathes missing the tailstock. It's a vicious circle.

If only we didn't die some day, they wouldn't go missing.....

 

[TorontoBuilder]

I think you have cracked the missing tailstock riddle......

I used to think it was cronic filing that caused the shortage of tailstock. But I'm realizing it's really unintended consequences causing all this chaos.

Assuming both pilers and filers hide their tailstock to stop theft, then die, their spouses would all sell the lathe without a tailstock. That's prolly how/why we get drowned in lathes missing the tailstock. It's a vicious circle.

If only we didn't die some day, they wouldn't go missing.....

I do believe that the loss is do to the disinterest and disregard of spouses, who refuse to listen to our instructions while we are alive.

Hence, put everything in writing... this is here, that is there, and never let so and so have any of my tools

 

[JustaDB]

Damn that so & so!

 

[jcdammeyer]

All I can say is wow! What a project!

 

[phaxtris]

Like I said you have a lot of faith in that skinny strap

Green ones are 2t rated, blue one is 1t rated, can you spot the difference from what you are using ? a round sling like the one on the left is less than 20$, it would be 20$ well spent IMO




Back to your sandblasting, don't forget to ground whatever you are blasting, blasting can creat a lot of static electricity in metal parts, especially in an electrically insulated small room

 

[TorontoBuilder]

Facts are facts, while many opinions are uninformed.

In the interest of assuring that members have access to facts over opinion I offer just one of a 100 available reports from scientists

Safety of Tubular Nylon Webbing: The Effect of Wet and Cold Environments​

Caleb Duncan and Landon Wright with John Salmon, Mechanical Engineering​

Tubular nylon webbing is an effective and relatively inexpensive anchoring solution for search and rescue groups, fire departments, canyoners, and rock climbers. As an anchoring solution nylon webbing is vital to the safety of anyone who uses it. Serious injury or death will often occur if an anchor fails.

All commercially available webbing is labeled with a breaking strength so that the end user is aware of its limits. This breaking strength value is obtained by the manufacture after running many tensile pull tests of dry webbing. While the dry breaking strength is reported by the manufacture no information, other than statements such as “tensile strength … will be reduced when wet” and “if the webbing becomes frozen it also loses strength,” is given about when wet or frozen webbing will fail1. Due to the often wet and harsh environments in which tubular nylon webbing is used, it is vital for search and rescue groups, firefighters, and climbers to understand how moisture and temperature affect the strength of their webbing. This is what we set out to test.

All the webbing we evaluated was cut to lengths of three feet (approx. 1 m), tied end-to-end to form a loop using a water knot, and pulled until failure. The tensile tester we used to pull the webbing measured the final load at failure and using this data we compiled our results.

We initiated our testing by pulling 30 dry unused samples as our control group to establish a baseline breaking strength. We then proceeded to test the environmental conditions that were hypothesized to drastically decrease webbing strength on four sets of 20 samples. These conditions, how we simulated them in the laboratory, and the results obtained are shown below.

Testing was also performed on 18 webbing samples taken from Cassidy Arch Canyon in Capitol Reef National Park to evaluate and test potential strength reduction in actual use environments. These samples had an average strength reduction of 27.8%.

Our testing shows that webbing exposed to water experiences a statistically significant decrease in its ultimate breaking strength while the effects of freezing are negligible. We also see that webbing which has seen actual environmental use, e.g., the webbing taken from Cassidy Arch Canyon, has a strength reduction of roughly four times that of the weakest condition from the laboratory experiments. This highlights how other environmental factors such as UV exposure, abrasion, and dirt likely have a more profound effect on strength reduction than water and freezing temperatures.

Despite the fact that water has a statistically significant effect on the strength of webbing it makes no difference in real world applications. The climbing webbing used in this study is rated by the manufacture to have a breaking strength of 4000 lbf. (17.7 kN), but our control group averaged a breaking strength of 5019 lbf (22.33 kN). This means that even with the reduction in strength due to water the wet webbing we tested was still able to carry more load than the manufacturer advertises.

We can conclude from the results of our testing that if used in wet conditions tubular nylon webbing will experience a small reduction in strength. This reduction is of little or no consequence to the men and women who rely on webbing for their safety so long as the manufacturer’s instructions and safe anchoring techniques are followed. Our findings also highlight the need for further research in order to determine and quantify the effects that other environmental factors such as UV light, abrasion, and dirt have on webbing strength.

Sources​

1. Webbing: Use Instructions. BlueWater Ropes, 2015