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Adjustable Height Workbench

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Blog entry by MrRon posted 04-05-2013 07:13 PM 2662 reads 2 times favorited 7 comments Add to Favorites Watch

After reading many threads on this and other forums, regarding the correct workbench height, I have concluded that one size does not fit all. Bench height is dependent on the height of the person and the type of work being performed. Additionally there have been concerns from people with bad backs. It is therefore my opinion that everyone can profit from a bench with an adjustable height feature.
bench.

This is not an easy one day to come up with an adjustable bench project. A bench that is fixed in height can be a very simple project that can be completed in a day with a small outlay of cash and materials, but a bench with height adjustment features will require a lot more thought. The simplest height adjustment is to make each leg adjustable in length, pinned with bolts and nuts. Although this may be the simplest way, it requires much physical effort to accomplish; fine if the adjustment is of a semi-permanent nature, but impractical if height adjustment is required frequently.

An adjustable height bench will require some mechanical means to elevate and securely lock the top at the required position. There have been hydraulic and pneumatic means of doing this, but are beyond the ability of the average woodworker and his wallet. I have come up with my own design, which I feel will satisfy the needs of most woodworkers and won’t break the bank.

This will be an on-going project as I am in the process of finalizing the design, building a prototype and testing it. In the finalizing stage, I’m investigating various materials and components in an effort to keep the overall cost as low as possible without compromising it’s features. Below is a preliminary sketch of the proposed

The features of my bench are:

• Height adjustment from 30-3/4” to 43”
• All height and locking controls are located at one side and easily operated without kneeling or squatting which is good for people with bad backs.
• The legs are securely locked in position for a sturdy bench.
• The elevating mechanism uses two scissor jacks operating in tandem and driven by a cordless drill. A hand crank could be fitted if desired.
• The bench can be rolled around on built-in casters which retract automatically once the top is elevated.
• A torsion box or solid surface top can be used (not shown in the sketch).
• This particular bench measures 42” x 96”, but dimensions can be changed to suit your personal requirements.



7 comments so far

View huff's profile

huff

2810 posts in 2030 days


#1 posted 04-05-2013 07:20 PM

I’m on board MrRon,

I look forward to your progress on your table. I think you have a great idea and will be following along.

Thanks for sharing.

-- John @ http://www.thehuffordfurnituregroup.com

View slmndr's profile

slmndr

7 posts in 630 days


#2 posted 04-05-2013 07:39 PM

Looks great. It would be cool if you add some storage on each long side backing up to the jack rod. You can’t ever have enough storage.

-- Still looking for ideas and advice.

View Enoelf's profile

Enoelf

192 posts in 1008 days


#3 posted 04-05-2013 08:35 PM

Interesting concept. I second the addition of storage.
Looking forward to the blog.
Thanks for sharing.

-- Central Ohio, Still got 9 and 15/16 fingers!

View MrRon's profile

MrRon

2975 posts in 1988 days


#4 posted 04-05-2013 09:18 PM

Thank you all for the encouragement. Back problems are presently curtailing my shop time, but hope to be back at soon. In the meantime, I’m spending my time at the computer refining my design.

View Bill Szydlo's profile

Bill Szydlo

50 posts in 1432 days


#5 posted 04-06-2013 03:09 AM

Here is a link to a bench that operates similar to what you are describing. It uses one jack to raise and lower to top and one to raise the whole assembly so you can move the bench around the shop. http://www.jack-bench.com
I purchased the plans but have not gotten around to making it yet.

View MrRon's profile

MrRon

2975 posts in 1988 days


#6 posted 04-06-2013 04:06 PM

I’m familar with the Jack bench, although it wasn’t used as the basis for my design. I think it’s pretty expensive to build. My design is for a “basic” bench. There are so many variations possible, that I cannot cover them all. I thought about storage, but it would mean a major re-design. I would rather concentrate on the basic design and leave the type of top and storage up to the individual.

Just for discussion purposes, I thought about different ways to elevate the top. I thought about using a transmission jack, but for a long bench, I think there would be a binding problem, as the jack would be located at the center of the bench. If there was much weight on one end of the bench, it might not raise evenly and bind. For a short bench, say around 5’ long, I would consider using that type of jack.

Another was to use two trailer jacks, located where the scissor jacks are. I found I could get 10” of lift with a 1000# jack and 15” with a 1500# jack, but the bigger jack would limit the lowest bench height. Another reason for not going with trailer jacks was they are made with a swivel mechanism for use when trailering and has a wheel on the end. That means I would have to cut the mechanism and wheel off and weld on a plate for mounting. That wouldn’t be a problem for some, but it would involve welding and some metal work.

The type of casters are another area I explored. They need to be a swivel type, no locking device and be able to rotate within a 5” square. That limits me to a 2” to 2-1/2” caster. Any larger, and it won’t clear the sides of the column. The casters I plan to use are 2” diameter with a 150# capacity each.

I hope this gives you some idea what to expect. Keep watching.

View Bluepine38's profile

Bluepine38

2953 posts in 1830 days


#7 posted 04-07-2013 03:47 PM

A friend with a bad back is building an adjustable bench, but he has four 1-1/2” X 18” acme rods with nuts
he picked up from salvage a while back, they will be connected with a chain and gear setup powered by a
12 volt reversing motor. We are finishing a custom kitchen for his wife and only working on it in the spare
time, so it will be a while before it is finished.

-- As ever, Gus-the 76 yr young apprentice carpenter

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