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Home Model Engine Machinist > Building Them > General Engine Discussion > BF20LV Draw bar thread confusion

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Old 11-19-2017, 10:31 AM   #31
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I don't know if it helps but before they sold Optimum, I purchased a Seig SX3 from Hare and Forbes with MT3 spindle and a 1/2" thread. I made a new drawbar. I've never used any 1/2" tooling. I just made sure every MT3 tool I bought had a M12 thread as I'm a metric only guy!

Details of making the drawbar start on page 4 of my "Rod's Aussie Shed" thread. The guys here were very helpful teaching me how to cut a thread.
http://www.homemodelenginemachinist....t=19885&page=4


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Old 11-19-2017, 06:04 PM   #32
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I finally got off my rear end and made the new draw bar for my BF20LV. The hardest part was cutting the internal M20 x 1.0 pitch internal thread on the ejector, I didn't want to remove the part from the lathe until I was sure the thread was correct. I cheated by making a male threaded plug first that I new was right, then used that to check the internal thread. (I tried to buy a M20 x 1.0 bolt but was told that they are not made). For the bar I used a grade 8.8 M12 bolt, removed the head and threaded it to take 16mm ring for the ejector. I capped it off with a dome nut, loctited and pinned to end. Works well but it took me the best part of the day to make. I'm the same as Rod, a metric only guy, I,m not going to make another for WW! Cheers, Peter


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Old 11-20-2017, 03:02 AM   #33
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New toys in the garage,

All I need is some younger creatures with bigger muscles to help with getting them on the bench.
I settled for the BF20LV mill and and L160 lathe.
Should have everything I need to nail this draw bad thing once I clean the gunk off them.

Wish me luck.
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Old 11-20-2017, 03:45 AM   #34
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Marvin, love to see some pics of your shed when you have it all set up. Cheers, Peter.
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Old 11-20-2017, 03:46 AM   #35
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sure, it'll be a bit squeezy but i think it should work well
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Old 11-21-2017, 09:46 AM   #36
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Quote:
Originally Posted by marvin_schwartz View Post
All I need is some younger creatures with bigger muscles to help with getting them on the bench.
Do not rely on muscles - they will rip in the worst case as will your back

I bought me a motor-crane to handle these parts between floor, machine base and every were else.

Thomas
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Old 11-22-2017, 03:12 AM   #37
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Quote:
Originally Posted by miglincit View Post
Do not rely on muscles - they will rip in the worst case as will your back

I bought me a motor-crane to handle these parts between floor, machine base and every were else.

Thomas
Another option is a chain fall and a place to hang it. But I otherwise totally agree find a way to take the muscles out of the equation. Besides if those young guys drop something you are going to feel real bad. Frankly anything more than 75 pounds can justify a mechanical aid.
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Old 11-22-2017, 01:15 PM   #38
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We wound up using a motorcycle hydraulic lifter.
The sort of thing you service motorcycles on.

We were able to walk the units across to the lifter, Pump it up to almost bench height and then slide it over to the bench space.
That way no one needed to lift the units and there was no danger of dropping them.


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