litchralee

This is different than the promo from two days ago.

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cross-posted from: https://sh.itjust.works/post/20965205

This is the story of how I turned a 15" Titan adjustable dumbbell to be 80 cm (31.5 inch) long. Why? Because I have a space-constrained home gym but still wanted a leg press, and so I had to remove its original barbell.

In its place, I built a pair of wood mounts for a normal barbell to rest upon, covered in that earlier post. However, since this machine is wall-adjacent, such a barbell would have to fit inside the width of the leg press, so about 80 cm. But must also be wider than the spacing from outside-edge to outside-edge of the wood mounts, which is 60 cm.

Such a short barbell -- or long dumbbell -- does not readily exist commercially, with the narrowest one I've seen being 48 inch barbells, which are still too wide. So I decided to build my own, using my spare Titan dumbbell as the base.

To start, the Titan dumbbells are excellent in this capacity, as the shaft diameter is 28 mm -- not 32 mm as the website would indicate -- which is a common diameter, if I am to cut short a cheap barbell to replace this dumbbell's shaft.

In keeping with my preexisting frugality, I purchased a cheap 1-inch barbell, hoping that it adopts the Olympic 28 mm shaft diameter, and not the 29 mm deadlift bar shaft diameter, as the Titan collars have small clearances. Matching neither, I find that this bar is closer to 23 mm, which although will fit into the existing collars, poses its own issues.

Nevertheless, this 7 ft barbell can conveniently be cut in half to yield two 42 inch segments. And then the included bar stops can be loped off, and then the length further refined to 77 cm, thus hiding the marks from the bar stop within the Titan collars, and also centering the (meh) knurling from the cheap bar.

But perhaps a picture will be more explanatory. Here, the original collar is dismantled at the top, showing the original shaft with a groove cut into it, about 1/4-inch from the end. Into that groove would fit two half-rings with an inner diameter of 20.4 mm and an outer diameter of 40 mm. In fact, all the parts inside the collar use 40 mm outer diameter, except the spacer cylinder, which is smaller at 37 mm. All of these parts are held captive within the collar using the C-ring and the geometry of the collar itself.

To deal with the difference between the collar expecting 28 mm, and the cheap bar's 23 cm, I designed an ABS 3d printed part in FreeCAD to act as a bushing, upon which the original Titan brass bushing will ride upon. This ABS bushing is held captive by way of its center bulge, which fits within the dead space inside the collar.

As for how I cut the groove into the end of the new shaft, I still don't own a lathe. So the next best is to mount an angle grinder onto a "cross slide vise" taken from a drill press, with the shaft secured in a wooden jig to only allow axial rotation manually. The vise allows precision control for the cutting wheel's depth, with me pausing frequently to measure how close the groove is to the desired 20.4 mm inner diameter. This is.... not a quick nor precise process. But it definitely works.

After reassembling both collars onto the new shaft and lubricating with white lithium, the final result is a long dumbbell (or short barbell) with Titan's 3.5 inch collars on the end, with 63 cm of shaft exposed and 80 cm from end to end. The ABS bushing is remarkably smooth against the brass bushing, after some sanding with 180 grit. The whole dumbbell weights 5.48 kg empty.

Here is the comparison with the stock Titan dumbbell. It's pretty amazing how the knurling conveniently lined up. It fits well onto the wood mounts of the leg press.

But why would I do all this just to add a weirdly long 3.5-inch collar dumbbell to a leg press, when it already can accept weights underneath the carriage? I will answer that in a follow-up post.

This is the story of how I turned a 15" Titan adjustable dumbbell to be 80 cm (31.5 inch) long. Why? Because I have a space-constrained home gym but still wanted a leg press, and so I had to remove its original barbell.

In its place, I built a pair of wood mounts for a normal barbell to rest upon, covered in that earlier post. However, since this machine is wall-adjacent, such a barbell would have to fit inside the width of the leg press, so about 80 cm. But must also be wider than the spacing from outside-edge to outside-edge of the wood mounts, which is 60 cm.

Such a short barbell -- or long dumbbell -- does not readily exist commercially, with the narrowest one I've seen being 48 inch barbells, which are still too wide. So I decided to build my own, using my spare Titan dumbbell as the base.

To start, the Titan dumbbells are excellent in this capacity, as the shaft diameter is 28 mm -- not 32 mm as the website would indicate -- which is a common diameter, if I am to cut short a cheap barbell to replace this dumbbell's shaft.

In keeping with my preexisting frugality, I purchased a cheap 1-inch barbell, hoping that it adopts the Olympic 28 mm shaft diameter, and not the 29 mm deadlift bar shaft diameter, as the Titan collars have small clearances. Matching neither, I find that this bar is closer to 23 mm, which although will fit into the existing collars, poses its own issues.

Nevertheless, this 7 ft barbell can conveniently be cut in half to yield two 42 inch segments. And then the included bar stops can be loped off, and then the length further refined to 77 cm, thus hiding the marks from the bar stop within the Titan collars, and also centering the (meh) knurling from the cheap bar.

But perhaps a picture will be more explanatory. Here, the original collar is dismantled at the top, showing the original shaft with a groove cut into it, about 1/4-inch from the end. Into that groove would fit two half-rings with an inner diameter of 20.4 mm and an outer diameter of 40 mm. In fact, all the parts inside the collar use 40 mm outer diameter, except the spacer cylinder, which is smaller at 37 mm. All of these parts are held captive within the collar using the C-ring and the geometry of the collar itself.

To deal with the difference between the collar expecting 28 mm, and the cheap bar's 23 cm, I designed an ABS 3d printed part in FreeCAD to act as a bushing, upon which the original Titan brass bushing will ride upon. This ABS bushing is held captive by way of its center bulge, which fits within the dead space inside the collar.

As for how I cut the groove into the end of the new shaft, I still don't own a lathe. So the next best is to mount an angle grinder onto a "cross slide vise" taken from a drill press, with the shaft secured in a wooden jig to only allow axial rotation manually. The vise allows precision control for the cutting wheel's depth, with me pausing frequently to measure how close the groove is to the desired 20.4 mm inner diameter. This is.... not a quick nor precise process. But it definitely works.

After reassembling both collars onto the new shaft and lubricating with white lithium, the final result is a long dumbbell (or short barbell) with Titan's 3.5 inch collars on the end, with 63 cm of shaft exposed and 80 cm from end to end. The ABS bushing is remarkably smooth against the brass bushing, after some sanding with 180 grit. The whole dumbbell weights 5.48 kg empty.

Here is the comparison with the stock Titan dumbbell. It's pretty amazing how the knurling conveniently lined up. It fits well onto the wood mounts of the leg press.

But why would I do all this just to add a weirdly long 3.5-inch collar dumbbell to a leg press, when it already can accept weights underneath the carriage? I will answer that in a follow-up post.

When uploading photos using the desktop website, make sure to select Full Resolution in the Upload Preferences.

Use the code on the Walgreens app and the website to claim the same offer twice!

When uploading photos using the desktop website, make sure to select Full Resolution in the Upload Preferences.

As is their custom, FortNine delivers a two-wheeler review in the most cinematic way possible, along with a dose of British sitcom humor.

I'm not sure I'd ever buy one, but I'd definitely borrow it from a friend haha. I've said before that I like seeing what novel ideas people will build atop two wheels, and this certainly is very unique.

The title describes the gist of things. In 18 months of owning my Bikonit MD750, I've traveled over 2100 km (1300 miles) in day, night, and rain; swapped out four sets of tires trying to lower the rolling resistance; built my own new set of 29" wheels with ebike-speed rated tires; and have taken it on mixed-mode adventures by using light-rail as my range extender.

It's the latter where the weight is a small issue, as the light rail train has three stairsteps onboard, which I have to carry the bike up and onto. 43 kg is kinda a lot, although that does include all the things I will need for a day out. I can pursue getting stronger to lift it more easily, or convincing the transit department to acquire low-floor trains, but I'd like to know my options:

What are some Class 3, mid-drive ebikes currently available in the USA, that weigh less than 43 kg (95 lbs)? Ideally, less than 25 kg (55 lbs) too, as that's the most common weight restriction for buses. I want to see what y'all can recommend, irrespective of price or range or other considerations.

I'm not likely to terminate my investment in this current ebike, as it's provided sterling service thus far. But I wonder if maybe what I have has already been outmoded by the latest developments in this ever-changing slice of the mobility space.

TY in advance!

One thing I've always wanted for my space-constrained homegym is a leg press. But even the most compact leg presses occupy a lot of space lengthwise and width-wide. I had my eye on the Force USA 45 degree leg press/hack squat combo machine, because it has so much capacity for me to grow into. So I picked one up and modified it so it can be placed up against the wall.

The primary issue is the barbell that attaches to the carriage (the part that moves up and down). This barbell extends about 45 cm (18 inch) beyond the left and right sides of the machine, taking up stationary space as well as dynamic space when the carriage is in motion. Eliminating that barbell would reduce the width requirement from the bare minimum of 162 cm to 80 cm, assuming the weight storage pegs are also removed.

But of course, the barbell is how the leg press is loaded, with 34 cm on each end for Olympic-spec plates. It also provides some structural stability for the hack squat shoulder pads, where they attach to the carriage. However, dangling underneath the carriage is a much-smaller space for loading plates, with 20 cm on left/right for plates.

As an aside, this is a fairly substantial machine that arrived on a pallet, taking a few hours to assemble. The build quality is exemplary, and everything about it evinces durability and stability.

My approach was to remove the original barbell, loading only the under-carriage bar. To retain structure, I cut 1"x2" rectangular steel tube to the width of the carriage (59 cm), capped the ends, and drilled holes to reuse the same bolts as the original barbell. The reason for 1"x2" is because the backrest for the hack squat requires clearance; the stock barbell solved this by bending around that area, whereas 1x2 just barely clears the backrest, and that's good enough for me.

Later, I added a pair of wooden mounts where a conventional barbell can be rested. This is not my proudest woodworking achievement, but it's certainly the most unconventional. Each mount is made from three layers of reclaimed 2x6 lumber (from a bed frame) glued together, then a 3.5-inch diameter hole bored through axially, then sanded, stained in cherry, and finished with Polycrylic clear coat for durability. I'll explain the point of these mounts in a different post.

The result of all this is a leg press that needs only about 1 meter by 2.4 meter (39" by 96") of floor space, and that's including weight storage pegs on the side away from the wall, plus space to swing the safety stopper bars in/out of place. And everything can be reverted back to the factory configuration.

The caveat is that I'm consigned to the 40 cm total barbell space under the carriage. To maximally load this machine, I would need to invest in thin iron plates, which apparently only are made to precise values, and are thus expensive. Examples: Rogue calibrated KG plates, and Hansu Power calibrated plates, both of which are 22.5 mm wide for 20 kg plates. Sixteen such plates would make 320 kg (700 lbs), and I'd be thrilled if I could get there one day. The tradeoff is reasonable to me, minimizing floor space today in exchange for requiring expensive plates in the future, until I upsize my space.

cross-posted from: https://sh.itjust.works/post/20133956

With the exception of the weight stack for my functional trainer and its change plates, I wanted all my subsequent equipment to be metric. To that end, I saw some cheap 45 lbs CAP bumper plates, and figured that I could make them into metric with not too much effort.

Some rough math prior to purchasing suggested that these plates -- with a width of 68 mm -- could be slimmed down from 20.4 kg (45 lbs) to nearly 20.0 kg, by boring two 2" holes (51 mm). To keep balance, the holes should be on on diametrically opposite ends. And should be neither too close to the edge, nor too close to the center, since the plate still needs to absorb a drop without deforming. That the bored holes are 51 mm is a fantastic happenstance, nearly identical to the center hole for Olympic-spec plates.

Examining each plate before drilling, I found that the silkscreen letter A in "CAP" is well-centered diametrically, although it doesn't line up with the matching logo on the back side. Also, since these are cheap CAP plates, the initial weight tolerances are pretty poor. 45 lbs should be 20.41 kg (2 sig figs), but my first four plates registered at 20.58, 20.51, 20.64, 20.56. That's nearly an extra half pound!

To drill the holes perfectly plumb, I did the work on a drill press using a 2-inch hole saw. Because the saw wasn't deep enough to go through the full width in one pass, I started with a 1/4-inch (6 mm) pilot hole straight through the tip of the letter A in "CAP". Then I drilled from both sides with the hole saw until a ~200 gram rubber core fell out. Repeat for the second bore.

To finish, I took some sandpaper to remove the old "45 lbs" markings, then used my label maker to affix new values. All plates are still high, but ranged from 20.030 kg to 20.105 kg. Not too shabby, I think.

In a happy coincidence, the position of these bored holes is perfect for one's thumbs when grasping the plate like a steering wheel, making it easier to pick up when laid flat on the floor. I also added a strip of blue electrical tape around the perimeter to make it easy to identify these as 20 kg.

In the end, I got the cheap metric plates I wanted, and it came with a usability improvement as well. I've not dropped these yet, so time will tell how they hold up.

With the exception of the weight stack for my functional trainer and its change plates, I wanted all my subsequent equipment to be metric. To that end, I saw some cheap 45 lbs CAP bumper plates, and figured that I could make them into metric with not too much effort.

Some rough math prior to purchasing suggested that these plates -- with a width of 68 mm -- could be slimmed down from 20.4 kg (45 lbs) to nearly 20.0 kg, by boring two 2" holes (51 mm). To keep balance, the holes should be on on diametrically opposite ends. And should be neither too close to the edge, nor too close to the center, since the plate still needs to absorb a drop without deforming. That the bored holes are 51 mm is a fantastic happenstance, nearly identical to the center hole for Olympic-spec plates.

Examining each plate before drilling, I found that the silkscreen letter A in "CAP" is well-centered diametrically, although it doesn't line up with the matching logo on the back side. Also, since these are cheap CAP plates, the initial weight tolerances are pretty poor. 45 lbs should be 20.41 kg (2 sig figs), but my first four plates registered at 20.58, 20.51, 20.64, 20.56. That's nearly an extra half pound!

To drill the holes perfectly plumb, I did the work on a drill press using a 2-inch hole saw. Because the saw wasn't deep enough to go through the full width in one pass, I started with a 1/4-inch (6 mm) pilot hole straight through the tip of the letter A in "CAP". Then I drilled from both sides with the hole saw until a ~200 gram rubber core fell out. Repeat for the second bore.

To finish, I took some sandpaper to remove the old "45 lbs" markings, then used my label maker to affix new values. All plates are still high, but ranged from 20.030 kg to 20.105 kg. Not too shabby, I think.

In a happy coincidence, the position of these bored holes is perfect for one's thumbs when grasping the plate like a steering wheel, making it easier to pick up when laid flat on the floor. I also added a strip of blue electrical tape around the perimeter to make it easy to identify these as 20 kg.

In the end, I got the cheap metric plates I wanted, and it came with a usability improvement as well. I've not dropped these yet, so time will tell how they hold up.

When uploading photos using the desktop website, make sure to select Full Resolution in the Upload Preferences.

Use the code on the Walgreens app and the website to claim the same offer twice!

When uploading photos using the desktop website, make sure to select Full Resolution in the Upload Preferences.