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Any Machinist Savy Folks On Here?

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Blog entry by Edwardnorton posted 04-04-2014 07:26 AM 757 reads 0 times favorited 11 comments Add to Favorites Watch

I was wondering if there are any machinists here on Lumberjocks. This has been a longtime favorite place of mine to get idea’s as well as admire the work of others so I thought why not ask and see.

I am trying to find out how to couple a 5/16ths leaf blower motor shaft to a 9/16ths arbor / bolt so I can attach a 6-1/4” circular saw blade to it. What I am attempting to do is make myself a mini table saw for cutting small woodcraft parts. I’ve looked at several manufactured ones via the internet as well as catalogs but LORD those cost nearly as much as a 10” contractors table saw. Take for example the MicroLux Digital Table Saw, it comes in at a whopping $380 and the Proxxon Micro Table Saw FET, Model 37070 listing for $390.00!

I went to good ol Harbor Freight (cough, hack, gag) and bought there version of a min saw and I returned it within a couple of hours. It would almost cut a toothpick without blogging down.

Anyway, One of my B&D leafhog blower ended up with a busted housing so I removed the motor. I had a couple of DualSaw 6-1/4” Destroyer Multi-Purpose Blades so I thought, why not?! The motor is strong enough to handle the load of cutting 1/4” ACX Plywood. I know, I tried it BUT the method of connecting the saw blade to the smaller motor shaft was not the brightest idea I’ve ever had. No details offered other than I am lucky to still be uninjured. HA!

So my fellow “jocks”, any idea’s?

-- EdwardNorton



11 comments so far

View RICOCO's profile

RICOCO

29 posts in 1305 days


#1 posted 04-04-2014 10:42 AM

I’m only a hobby machinist, but this is my best guess with the limited info.

You have 3 options, 1: make a bushing out of brass or plastic to reduce the 9/16 to 5/16. 2: make a 5/16 to 9/16 shaft that mounts to the motor. 3: the best and most costly would be a separate drive shaft and pulleys connected to the motor.

Without seeing the setup that you intend I would recommend option 1.

shoot me a note if you would like more help.

-- Paul

View Bluepine38's profile

Bluepine38

2939 posts in 1808 days


#2 posted 04-04-2014 04:29 PM

If you make a bushing connection for the motor and arbor, are you going to attach it to table saw type
surface, or are you planning on raising and lower it and tilting it like a regular table saw? It might be less
expensive to find an old Delta Homecraft 8” table saw and rebuild it then use either 7-14” or 8” blades on
it. Building your own saw would be fun, but the end result might be unsafe unless you can add some
guards and safety features.

-- As ever, Gus-the 75 yr young apprentice carpenter

View bko's profile

bko

115 posts in 1740 days


#3 posted 04-04-2014 08:15 PM

Putting the saw blade directly on the motor arbor is going to wreck the leaf blower motor bearings fairly quickly. It is just wasn’t built for that kind of load.

Why not just put a circular saw upside down under a sheet of plywood? That kind of poor man’s table saw has been around a long time and the saw’s bearings are least designed to take that kind load.

View Grumpymike's profile

Grumpymike

1153 posts in 1038 days


#4 posted 04-04-2014 09:13 PM

+1 BKO … Building a high speed shaft to convert ‘A’ size to ‘B’ size is an engineering challenge … (think wobble here).
You could make a 5/16 to spline shaft, then a small ‘U’ joint, to a spline and the 9/16 … But it would cost twice the price of a circular saw.

-- Grumpy old guy, and lookin' good Doin' it. ... Surprise Az.

View rg33's profile

rg33

51 posts in 725 days


#5 posted 04-05-2014 12:15 AM

You could make/buy something like this:

http://www.mcmaster.com/#standard-shaft-couplings/=re9xc8

(look at far right side theyre called shaft adapters) and put an external thread for the 9/16” arbor.

BUT, like others have said, youre leaf blower motor likely doesnt have the kind of bearings needed to take a load on the arbor like a table saw would and would not be a good idea. More importantly for safety, the coupling will undoubtedly come with even a minute amount of eccentricity which will make this setup precarious if not outright dangerous. By the time you look at the time and money invested you could probably get by with a used circular saw
I’d save that motor and use it for a home made dust collector and in the mean time look for a used saw on CL etc.

View Edwardnorton's profile

Edwardnorton

70 posts in 650 days


#6 posted 04-06-2014 09:20 AM

@ RICOCO; Thanks for the advice. I’ll have to figure out how to show pictures on this site, I know that would help immensely for those trying to help others.

-- EdwardNorton

View Edwardnorton's profile

Edwardnorton

70 posts in 650 days


#7 posted 04-06-2014 09:21 AM

@ rg33; Appreciate the link! I think I may find what I am looking for there!

-- EdwardNorton

View Edwardnorton's profile

Edwardnorton

70 posts in 650 days


#8 posted 04-06-2014 09:26 AM

@ bko; Your probably right under normal table saw conditions but I am wanting to do this in order to cut small parts out of 1/4” or 2/8ths plywood. To make small craft items like you would find at a lumberyard / home center in the balsa wood department for those that build doll houses or to build what they have laid out on drafting paper. You know, 1/4” x 1/4” two by fours etc.

I have a 10” table saw in my little shop now but I appreciate the idea for turning a circular saw into a table saw. Along that line I suppose I could do that with my 5 1/2” circular saw. THANKS!

-- EdwardNorton

View Edwardnorton's profile

Edwardnorton

70 posts in 650 days


#9 posted 04-06-2014 09:27 AM

@ Grumpymike; Your probably right. Appreciate the input none the less!

-- EdwardNorton

View Edwardnorton's profile

Edwardnorton

70 posts in 650 days


#10 posted 04-06-2014 10:17 AM

Hope I didn’t miss anyone, THANKS again guys!

-- EdwardNorton

View Grumpymike's profile

Grumpymike

1153 posts in 1038 days


#11 posted 04-06-2014 06:13 PM

Edward, I had a latent thought; as you are using such light material, have you considered one of the vibratory saws? ... Might fit your needs … Just a thought.

-- Grumpy old guy, and lookin' good Doin' it. ... Surprise Az.

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