Beginner’s engine build. Simplex 5″g.

[David WassonParticipant @davidwasson11489]

No problem, happens to everyone.

[David WassonParticipant @davidwasson11489]

No problem, happens to everyone.

[Russell EberhardtParticipant @russelleberhardt48058]

I may have missed it but I don't think anyone has mentioned yet the need to aneal the frame material before cutting. If you are using BMS it tends to distort after cutting out for the axle boxes.

Russell

[David WassonParticipant @davidwasson11489]

Yes, sometimes BMS will distort when you stress relieve it, like cutting out the space for the axle boxes. I used 1/8" BMS, and it did not distort. Although, I did make sure that the material was as flat as possible before cutting. Also, to a certain degree, the frame spacers and front and rear beams will keep the frames straight. Make sure everything is perfectly square when you clamp and drill for the screws that hold everything together.

[Phil H1Participant @philh196021]

Many people mention the BMS distortion but I have cut 6 sets of frames out using BMS and I have never had any distortion. Perhaps certain batches of BMS are particularly bad?

[David WassonParticipant @davidwasson11489]

Perhaps distortion has happened to those that had frames that were particularly narrow. These frames are pretty wide. I certainly had no problem with distortion. Hopefully, it was not just luck!

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